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28-------------------------------------------------------------------------------
29-- $Id: INSTALL,v 1.235 2021/10/19 23:34:17 tom Exp $
30---------------------------------------------------------------------
31             How to install Ncurses/Terminfo on your system
32---------------------------------------------------------------------
33
34    ************************************************************
35    * READ ALL OF THIS FILE BEFORE YOU TRY TO INSTALL NCURSES. *
36    ************************************************************
37
38You should be reading the file INSTALL in a directory called ncurses-d.d, where
39d.d is the current version number.  There should be several subdirectories,
40including `c++', `form', `man', `menu', 'misc', `ncurses', `panel', `progs',
41and `test'.  See the README file for a roadmap to the package.
42
43If you are a distribution integrator or packager, please read and act on the
44section titled FOR SYSTEM INTEGRATORS below.
45
46If you are converting from BSD curses and do not have root access, be sure
47to read the BSD CONVERSION NOTES section below.
48
49If you are trying to build applications using gpm with ncurses,
50read the USING NCURSES WITH GPM section below.
51
52If you are cross-compiling, see the note below on BUILDING WITH A CROSS-COMPILER.
53
54If you want to build the Ada95 binding, go to the Ada95 directory and
55follow the instructions there.  The Ada95 binding is not covered below.
56
57
58REQUIREMENTS:
59------------
60
61You will need the following to build and install ncurses under UNIX:
62
63	* ANSI C compiler  (gcc, for instance)
64	* sh               (bash will do)
65	* awk              (mawk or gawk will do)
66	* sed
67	* BSD or System V style install (a script is enclosed)
68
69Ncurses has been also built in the OS/2 EMX environment.
70
71
72INSTALLATION PROCEDURE:
73----------------------
74
751.  First, decide whether you want ncurses to replace your existing library (in
76    which case you'll need super-user privileges) or be installed in parallel
77    with it.
78
79    The --prefix option to configure changes the root directory for installing
80    ncurses.  The default is normally in subdirectories of /usr/local, except
81    for systems where ncurses is normally installed as a system library (see
82    "IF YOU ARE A SYSTEM INTEGRATOR").  Use --prefix=/usr to replace your
83    default curses distribution.
84
85    The package gets installed beneath the --prefix directory as follows:
86
87    In $(prefix)/bin:          tic, infocmp, captoinfo, tset,
88				reset, clear, tput, toe, tabs
89    In $(prefix)/lib:          libncurses*.* libcurses.a
90    In $(prefix)/share/terminfo: compiled terminal descriptions
91    In $(prefix)/include:      C header files
92    Under $(prefix)/man:       the manual pages
93
94    Note that the configure script attempts to locate previous installation of
95    ncurses, and will set the default prefix according to where it finds the
96    ncurses headers.
97
98    Do not use commands such as
99
100	make install prefix=XXX
101
102    to change the prefix after configuration, since the prefix value is used
103    for some absolute pathnames such as TERMINFO.  Instead do this
104
105	make install DESTDIR=XXX
106
107    See also the discussion of --with-install-prefix.
108
1092.  Type `./configure' in the top-level directory of the distribution to
110    configure ncurses for your operating system and create the Makefiles.
111    Besides --prefix, various configuration options are available to customize
112    the installation; use `./configure --help' to list the available options.
113
114    If your operating system is not supported, read the PORTABILITY section in
115    the file ncurses/README for information on how to create a configuration
116    file for your system.
117
118    The `configure' script generates makefile rules for one or more object
119    models and their associated libraries:
120
121	libncurses.a (normal)
122
123	libcurses.a (normal, a link to libncurses.a)
124		This gets left out if you configure with --disable-overwrite.
125
126	libncurses.so (shared)
127
128	libncurses_g.a (debug)
129
130	libncurses_p.a (profile)
131
132	libncurses.la (libtool)
133
134    If you configure using the --enable-widec option, a "w" is appended to the
135    library names (e.g., libncursesw.a), and the resulting libraries support
136    wide-characters, e.g., via a UTF-8 locale.  The corresponding header files
137    are compatible with the non-wide-character configuration; wide-character
138    features are provided by ifdef's in the header files.  The wide-character
139    library interfaces are not binary-compatible with the non-wide-character
140    version.  Building and running the wide-character code relies on a fairly
141    recent implementation of libiconv.  We have built this configuration on
142    various systems using libiconv, sometimes requiring libutf8.
143
144    If you configure using the --with-pthread option, a "t" is appended to
145    the library names (e.g., libncursest.a, libncursestw.a).
146
147    If you do not specify any models, the normal and debug libraries will be
148    configured.  Typing `configure' with no arguments is equivalent to:
149
150	./configure --with-normal --with-debug --enable-overwrite
151
152    Typing
153
154	./configure --with-shared
155
156    makes the shared libraries the default, resulting in
157
158	./configure --with-shared --with-normal --with-debug --enable-overwrite
159
160    If you want only shared libraries, type
161
162	./configure --with-shared --without-normal --without-debug
163
164    Rules for generating shared libraries are highly dependent upon the choice
165    of host system and compiler.  We've been testing shared libraries on
166    several systems, but more work needs to be done to make shared libraries
167    work on other systems.
168
169    If you have libtool installed, you can type
170
171	./configure --with-libtool
172
173    to generate the appropriate static and/or shared libraries for your
174    platform using libtool.
175
176    You can make curses and terminfo fall back to an existing file of termcap
177    definitions by configuring with --enable-termcap.  If you do this, the
178    library will search /etc/termcap before the terminfo database, and will
179    also interpret the contents of the TERM environment variable.  See the
180    section BSD CONVERSION NOTES below.
181
1823.  Type `make'.  Ignore any warnings, no error messages should be produced.
183    This should compile the ncurses library, the terminfo compiler tic(1),
184    captoinfo(1), infocmp(1), toe(1), clear(1) tset(1), reset(1), and tput(1)
185    programs (see the manual pages for explanation of what they do), some test
186    programs, and the panels, menus, and forms libraries.
187
1884.  Run ncurses and several other test programs in the test directory to
189    verify that ncurses functions correctly before doing an install that
190    may overwrite system files.  Read the file test/README for details on
191    the test programs.
192
193    NOTE: You must have installed the terminfo database, or set the
194    environment variable $TERMINFO to point to a SVr4-compatible terminfo
195    database before running the test programs.  Not all vendors' terminfo
196    databases are SVr4-compatible, but most seem to be.
197
198    It is possible to configure ncurses to use other terminfo database formats.
199    A few are provided as examples in the include-directory (see --with-caps).
200
201    If you run the test programs WITHOUT installing terminfo, ncurses may
202    read the termcap file and cache that in $HOME/.terminfo, which will
203    thereafter be used instead of the terminfo database.  See the comments
204    on "--enable-getcap-cache", to see why this is a Bad Thing.
205
206    The ncurses program is designed specifically to test the ncurses library.
207    You can use it to verify that the screen highlights work correctly, that
208    cursor addressing and window scrolling works OK, etc.
209
2105.  Once you've tested, you can type `make install' to install libraries,
211    the programs, the terminfo database and the manual pages.  Alternately, you
212    can type `make install' in each directory you want to install.  In the
213    top-level directory, you can do a partial install using these commands:
214
215	'make install.progs'    installs tic, infocmp, etc...
216	'make install.includes' installs the headers.
217	'make install.libs'     installs the libraries (and the headers).
218	'make install.data'     installs the terminfo data. (Note: `tic' must
219				be installed before the terminfo data can be
220				compiled).
221	'make install.man'      installs the manual pages.
222
223  ############################################################################
224  #     CAVEAT EMPTOR: `install.data' run as root will NUKE any existing     #
225  #  terminfo database. If you have any custom or unusual entries SAVE them  #
226  #  before you install ncurses.                                             #
227  ############################################################################
228
229    The terminfo(5) manual page must be preprocessed with tbl(1) before
230    being formatted by nroff(1).  Modern man(1) implementations tend to do
231    this by default, but you may want to look at your version's manual page
232    to be sure.  You may also install the manual pages after preprocessing
233    with tbl(1) by specifying the configure option --with-manpage-tbl.
234
235    If the system already has a curses library that you need to keep using
236    you'll need to distinguish between it and ncurses.  See the discussion of
237    --disable-overwrite.  If ncurses is installed outside the standard
238    directories (/usr/include and /usr/lib) then all your users will need to
239    use the -I option to compile programs and -L to link them.
240
241    If you have another curses installed in your system and you accidentally
242    compile using its curses.h you'll end up with a large number of
243    undefined symbols at link time.
244
245    IF YOU DO NOT HAVE ROOT: Change directory to the `progs' subdirectory
246    and run the `capconvert' script.  This script will deduce various things
247    about your environment and use them to build you a private terminfo tree,
248    so you can use ncurses applications.
249
250    If more than one user at your site does this, the space for the duplicate
251    trees is wasted.  Try to get your site administrators to install a system-
252    wide terminfo tree instead.
253
254    See the BSD CONVERSION NOTES section below for a few more details.
255
2566.  The c++ directory has C++ classes that are built on top of ncurses and
257    panels.  You must have c++ (and its libraries) installed before you can
258    compile and run the demo.
259
260    Use --without-cxx-binding to tell configure to not build the C++ bindings
261    and demo.
262
263    If you do not have C++, you must use the --without-cxx option to tell
264    the configure script to not attempt to determine the type of 'bool'
265    which may be supported by C++.  IF YOU USE THIS OPTION, BE ADVISED THAT
266    YOU MAY NOT BE ABLE TO COMPILE (OR RUN) NCURSES APPLICATIONS WITH C++.
267
268
269CONFIGURE OPTIONS:
270-----------------
271
272    The configure script provides a short list of its options when you type
273
274	./configure --help
275
276    The --help and several options are common to all configure scripts that are
277    generated with autoconf.  Those are all listed before the line
278
279	--enable and --with options recognized:
280
281    The other options are specific to this package.  We list them in alphabetic
282    order.
283
284    --disable-assumed-color
285	With ncurses 5.1, we introduced a new function, assume_default_colors()
286	which allows applications to specify what the default foreground and
287	background color are assumed to be.  Most color applications use
288	full-screen color; but a few do not color the background.  While the
289	assumed values can be overridden by invoking assume_default_colors(),
290	you may find it useful to set the assumed values to the pre-5.1
291	convention, using this configure option.
292
293    --disable-big-core
294	Assume machine has little memory.  The configure script attempts to
295	determine if your machine has enough memory (about 6Mb) to compile the
296	terminfo database without writing portions to disk.  Some allocators
297	return deceptive results, so you may have to override the configure
298	script.  Or you may be building tic for a smaller machine.
299
300    --disable-big-strings
301	Disable compile-time optimization of predefined tables which puts
302	all of their strings into a very long string, to reduce relocation
303	overhead.
304
305    --disable-database
306	Use only built-in data.  The ncurses libraries normally read terminfo
307	and termcap data from disk.  You can configure ncurses to have a
308	built-in database, aka "fallback" entries.  Embedded applications may
309	have no need for an external database.  Some, but not all of the
310	programs are useful in this configuration, e.g., tset and tput versus
311	infocmp and tic.
312
313    --disable-db-install
314	Do not install the terminal database.  This is used to omit features
315	for packages, as done with --without-progs.
316
317    --disable-echo
318	Use the option --disable-echo to make the build-log less verbose by
319	suppressing the display of the compile and link commands.  This makes
320	it easier to see the compiler warnings.  (You can always use "make -n"
321	to see the options that are used).
322
323    --disable-ext-funcs
324	Disable function-extensions.  Configure ncurses without the functions
325	that are not specified by XSI.  See ncurses/modules for the exact
326	list of library modules that would be suppressed.
327
328    --disable-gnat-projects
329	Disable GNAT projects even if usable, for testing old makefile rules.
330
331    --disable-hashmap
332	Compile without hashmap scrolling-optimization code.  This algorithm is
333	the default.
334
335    --disable-home-terminfo
336	The $HOME/.terminfo directory is normally added to ncurses' search
337	list for reading/writing terminfo entries, since that directory is
338	more likely writable than the system terminfo database.  Use this
339	option to disable the feature altogether.
340
341    --disable-largefile
342	Disable compiler flags needed to use large-file interfaces.
343
344    --disable-leaks
345	For testing, compile-in code that frees memory that normally would not
346	be freed, to simplify analysis of memory-leaks.
347
348	Any implementation of curses must not free the memory associated with
349	a screen, since (even after calling endwin()), it must be available
350	for use in the next call to refresh().  There are also chunks of
351	memory held for performance reasons.  That makes it hard to analyze
352	curses applications for memory leaks.  To work around this, build a
353	debugging version of the ncurses library which frees those chunks
354	which it can, and provides the _nc_free_and_exit() function to free
355	the remainder and then exit.  The ncurses utility and test programs
356	use this feature, e.g., via the ExitProgram() macro.
357
358	Because this lies outside of the library's intended usage, it is not
359	normally considered part of the ABI.  If there were some (as yet
360	unplanned) extension which frees memory in a manner that would let the
361	library resume and reallocate memory, then that would not use a "_nc_"
362	prefix.
363
364    --disable-lib-suffixes
365	Suppress the "w", "t" or "tw" suffixes which normally would be added
366	to the library names for the --enable-widec and --with-pthread options.
367
368    --disable-libtool-version
369	when using --with-libtool, control how the major/minor version numbers
370	are used for constructing the library name.
371
372	The default uses the -version-number feature of libtool, which makes
373	the library names compatible (though not identical) with the standard
374	build using --with-shared.
375
376	Use --disable-libtool-version to use the libtool -version-info feature.
377	This corresponds to the setting used before patch 20100515.
378
379	Starting with patch 20141115, using this option causes the configure
380	script to apply the top-level VERSION file to the ABI version used
381	for libtool.
382
383    --disable-lp64
384	The header files will ignore use of the _LP64 symbol to make chtype
385	and mmask_t types 32 bits (they may be long on 64-bit hosts, for
386	compatibility with older releases).
387
388	NOTE: this is potentially an ABI change, depending on existing
389	packages.  The default for this option is "disabled" for ncurses
390	ABI 5, and "enabled" for ABI 6.
391
392    --disable-macros
393	For testing, use functions rather than macros.  The program will run
394	more slowly, but it is simpler to debug.  This defines NCURSES_NOMACROS
395	at build time.  See also the --enable-expanded option.
396
397    --disable-overwrite
398	If you are installing ncurses on a system which contains another
399	development version of curses, or which could be confused by the loader
400	for another version, we recommend that you leave out the link to
401	-lcurses.  The ncurses library is always available as -lncurses.
402	Disabling overwrite also causes the ncurses header files to be
403	installed into a subdirectory, e.g., /usr/local/include/ncurses,
404	rather than the include directory.  This makes it simpler to avoid
405	compile-time conflicts with other versions of curses.h
406
407	Putting the header files into a subdirectory assumes that applications
408	will follow the (standard) practice of including the headers with
409	reference to the subdirectory name.  For instance, the normal ncurses
410	header would be included using
411
412		#include <ncurses/curses.h>
413		#include <ncurses/term.h>
414
415	while the ncursesw headers would be found this way:
416
417		#include <ncursesw/curses.h>
418		#include <ncursesw/term.h>
419
420	In either case (with or without the --disable-overwrite option),
421	almost all applications are designed to include a related set of
422	curses header files from the same directory.
423
424	Manipulating the --includedir configure option to put header files
425	directly in a subdirectory of the normal include-directory defeats
426	this, and breaks builds of portable applications.  Likewise, putting
427	some headers in /usr/include, and others in a subdirectory is a good
428	way to break builds.
429
430	When configured with --disable-overwrite, the installed header files'
431	embedded #include's are adjusted to use the same style of includes
432	noted above.  In particular, the unctrl.h header is included from
433	curses.h, which means that a makefile which tells the compiler to
434	include directly from the subdirectory will fail to compile correctly.
435	Without some special effort, it will either fail to compile at all,
436	or the compiler may find a different unctrl.h file.
437
438	In addition to the curses library, a system may provide its own
439	versions of the add-on libraries (form, menu, panel), which would
440	not be compatible with ncurses.  These options allow you to rename
441	ncurses' add-on libraries to avoid conflicts when linking:
442
443		--with-form-libname=XXX
444		--with-menu-libname=XXX
445		--with-panel-libname=XXX
446
447	Rather than renaming them abitrarily, a prefix or suffix is
448	recommended.  An "n" prefix provides consistency with ncurses versus
449	curses, i.e.,
450
451		--with-form-libname=nform
452		--with-menu-libname=nmenu
453		--with-panel-libname=npanel
454
455    --disable-pkg-ldflags
456	Omit options in $LDFLAGS and $EXTRA_LDFLAGS from the pkg-config ".pc"
457	and corresponding ncurses*-config script which normally are listed via
458	the "--libs" option.  These options are normally used to facilitate
459	linking to ncurses when it was configured to use the rpath feature.
460
461	See also --enable-rpath and --disable-rpath-hack.
462
463    --disable-relink
464	If --enable-rpath is given, the generated makefiles normally will
465	rebuild shared libraries during install.  Use this option to simply
466	copy whatever the linker produced.
467
468	Static libraries cannot simply be copied because tools use timestamps
469	to determine if the library's symbol table is up to date.  If your
470	install program supports the "-p" (preserve timestamp) option, that
471	is used when --disable-relink is given, to avoid rebuilding the symbol
472	table.
473
474	Finally, some tools ignore the subsecond timestamps supported by some
475	filesystems.  This option adds a 1-second sleep to help those tools
476	avoid unnecessary relinking during the install process.
477
478    --disable-root-access
479	Compile with environment restriction, so most file-access is limited
480	when running via a setuid/setgid application.
481
482    --disable-root-environ
483	Compile with environment restriction, so certain environment variables
484	are not available when running as root, or via a setuid/setgid
485	application.  These are (for example $TERMINFO) those that allow the
486	search path for the terminfo or termcap entry to be customized.
487
488    --disable-rpath-hack
489	Normally the configure script helps link libraries found in unusual
490	places by adding an rpath option to the link command.  If you are
491	building packages, this feature may be redundant.  Use this option
492	to suppress the feature.
493
494    --disable-scroll-hints
495	Compile without scroll-hints code.  This option is ignored when
496	hashmap scrolling is configured, which is the default.
497
498    --disable-stripping
499	Do not strip installed executables.
500
501    --disable-tic-depends
502	When building shared libraries, normally the tic library is linked to
503	depend upon the ncurses library (or equivalently, on the tinfo-library
504	if the --with-termlib option was given).  The tic- and tinfo-library
505	ABIs do not depend on the --enable-widec option.  Some packagers have
506	used this to reduce the number of library files which are packaged by
507	using only one copy of those libraries.  To make this work properly,
508	the tic library must be built without an explicit dependency on the
509	underlying library (ncurses vs ncursesw, tinfo vs tinfow).  Use this
510	configure option to do that.
511	For example
512		configure --with-ticlib --with-shared --disable-tic-depends
513
514    --disable-tparm-varargs
515	Portable programs should call tparm() using the fixed-length parameter
516	list documented in X/Open.  ncurses provides varargs support for this
517	function.  Use --disable-tparm-varargs to disable this support.
518
519    --enable-assertions
520	For testing, compile-in assertion code.  This is used only for a few
521	places where ncurses cannot easily recover by returning an error code.
522
523    --enable-broken_linker
524	A few platforms have what we consider a broken linker:  it cannot link
525	objects from an archive solely by referring to data objects in those
526	files, but requires a function reference.  This configure option
527	changes several data references to functions to work around this
528	problem.
529
530	NOTE: With ncurses 5.1, this may not be necessary, since we are
531	told that some linkers interpret uninitialized global data as a
532	different type of reference which behaves as described above.  We have
533	explicitly initialized all of the global data to work around the
534	problem.
535
536    --enable-bsdpad
537	Recognize BSD-style prefix padding.  Some ancient BSD programs (such as
538	nethack) call tputs("50") to implement delays.
539
540    --enable-colorfgbg
541	Compile with experimental $COLORFGBG code.  That environment variable
542	is set by some terminal emulators as a hint to applications, by
543	advertising the default foreground and background colors.  During
544	initialization, ncurses sets color pair 0 to match this.
545
546    --enable-const
547	The curses interface as documented in XSI is rather old, in fact
548	including features that precede ANSI C.  The prototypes generally do
549	not make effective use of "const".  When using stricter compilers (or
550	gcc with appropriate warnings), you may see warnings about the mismatch
551	between const and non-const data.  We provide a configure option which
552	changes the interfaces to use const - quieting these warnings and
553	reflecting the actual use of the parameters more closely.  The ncurses
554	library uses the symbol NCURSES_CONST for these instances of const,
555	and if you have asked for compiler warnings, will add gcc's const-qual
556	warning.  There will still be warnings due to subtle inconsistencies
557	in the interface, but at a lower level.
558
559	NOTE: configuring ncurses with this option may detract from the
560	portability of your applications by encouraging you to use const in
561	places where the XSI curses interface would not allow them.  Similar
562	issues arise when porting to SVr4 curses, which uses const in even
563	fewer places.
564
565    --enable-expanded
566	For testing, generate functions for certain macros to make them visible
567	as such to the debugger.  See also the --disable-macros option.
568
569    --enable-exp-win32
570	When configuring for MinGW, use the experimental Windows 10 driver.
571
572    --enable-ext-colors
573	Extend the cchar_t structure to allow more than 16 colors to be
574	encoded.  This applies only to the wide-character (--enable-widec)
575	configuration.
576
577	NOTE: using this option will make libraries which are not binary-
578	compatible with libncursesw 5.4.  None of the interfaces change, but
579	applications which have an array of cchar_t's must be recompiled.
580
581    --enable-ext-mouse
582	Modify the encoding of mouse state to make room for a 5th mouse button.
583	That allows one to use ncurses with a wheel mouse with xterm or
584	similar X terminal emulators.
585
586	NOTE: using this option will make libraries which are not binary-
587	compatible with libncursesw 5.4.  None of the interfaces change, but
588	applications which have mouse mask mmask_t's must be recompiled.
589
590    --enable-ext-putwin
591	Modify the file-format written by putwin() to use printable text rather
592	than binary files, allowing getwin() to read screen dumps written by
593	differently-configured ncurses libraries.  The extended getwin() can
594	still read binary screen dumps from the "same" configuration of
595	ncurses.  This does not change the ABI (the binary interface seen by
596	calling applications).
597
598    --enable-fvisibility
599    	Use the gcc "-fvisibility=hidden" option to make symbols which are not
600	explicitly exported, "hidden".  Doing this may reduce the number of
601	symbols exported in the C++ binding; it should have less effect on the
602	C libraries when symbol-versioning is used.
603
604    --enable-getcap
605	Use the 4.4BSD getcap code if available, or a bundled version of it to
606	fetch termcap entries.  Entries read in this way cannot use (make
607	cross-references to) the terminfo tree, but it is faster than reading
608	/etc/termcap.
609
610	If configured for one of the *BSD systems, this automatically uses
611	the hashed database system produced using cap_mkdb or similar tools.
612	In that case, there is no advantage in using the --enable-getcap-cache
613	option.
614
615	See also the --with-hashed-db option.
616
617    --enable-getcap-cache
618	Cache translated termcaps under the directory $HOME/.terminfo
619
620	NOTE: this sounds good - it makes ncurses run faster the second time.
621	But look where the data comes from - an /etc/termcap containing lots of
622	entries that are not up to date.  If you configure with this option and
623	forget to install the terminfo database before running an ncurses
624	application, you will end up with a hidden terminfo database that
625	generally does not support color and will miss some function keys.
626
627    --enable-hard-tabs
628	Compile-in cursor-optimization code that uses hard-tabs.  We would make
629	this a standard feature except for the concern that the terminfo entry
630	may not be accurate, or that your stty settings have disabled the use
631	of tabs.
632
633    --enable-interop
634	Compile-in experimental interop bindings.  These provide generic types
635	for the form-library.
636
637    --enable-mixed-case
638	Controls whether the filesystem on which the terminfo database resides
639	supports mixed-case filenames (normal for UNIX, but not on other
640	systems).  If you do not specify this option, the configure script
641	checks the current filesystem.
642
643    --enable-no-padding
644	Compile-in support for the $NCURSES_NO_PADDING environment variable,
645	which allows you to suppress the effect of non-mandatory padding in
646	terminfo entries.  This is the default, unless you have disabled the
647	extended functions.
648
649    --enable-opaque-curses
650    --enable-opaque-form
651    --enable-opaque-menu
652    --enable-opaque-panel
653	Define symbol in curses.h which controls whether some library
654	structures are treated as "opaque".  The --enable-opaque-curses option
655	is overridden by the --enable-reentrant option.
656
657    --enable-pc-files
658	If pkg-config is found (see --with-pkg-config), generate ".pc" files
659	for each of the libraries, and install them in pkg-config's library
660	directory.
661
662    --enable-pthreads-eintr
663	add logic in threaded configuration to ensure that a read(2) system
664	call can be interrupted for SIGWINCH.
665
666    --enable-reentrant
667	Compile configuration which improves reentrant use of the library by
668	reducing global and static variables.  This option is also set if
669	--with-pthread is used.
670
671	Enabling this option adds a "t" to the library names, except for the
672	special case when --enable-weak-symbols is also used.
673
674    --enable-rpath
675	Use rpath option when generating shared libraries, and (with some
676	restrictions) when linking the corresponding programs.  This originally
677	(in 1997) applied mainly to systems using the GNU linker (read the
678	manpage).
679
680	More recently it is useful for systems that require special treatment
681	shared libraries in "unusual" locations.  The "system" libraries reside
682	in directories which are on the loader's default search-path.  While
683	you may be able to use workarounds such as the $LD_LIBRARY_PATH
684	environment variable, they do not work with setuid applications since
685	the LD_LIBRARY_PATH variable would be unset in that situation.
686
687	This option does not apply to --with-libtool, since libtool makes
688	extra assumptions about rpath.
689
690    --enable-safe-sprintf
691	Compile with experimental safe-sprintf code.  You may consider using
692	this if you are building ncurses for a system that has neither
693	vsnprintf() or vsprintf().  It is slow, however, and is used only on
694	very old systems which lack vsnprintf().
695
696    --enable-signed-char
697	The term.h header declares a Booleans[] array typed "char".  But it
698	stores signed values there and "char" is not necessarily signed.
699	Some packagers choose to alter the type of Booleans[] though this
700	is not strictly compatible.  This option allows one to implement this
701	alteration without patching the source code.
702
703    --enable-sigwinch
704	Compile support for ncurses' SIGWINCH handler.  If your application has
705	its own SIGWINCH handler, ncurses will not use its own.  The ncurses
706	handler causes wgetch() to return KEY_RESIZE when the screen-size
707	changes.  This option is the default, unless you have disabled the
708	extended functions.
709
710    --enable-sp-funcs
711	Compile-in support for extended functions which accept a SCREEN pointer,
712	reducing the need for juggling the global SP value with set_term() and
713	delscreen().
714
715    --enable-stdnoreturn
716	When enabled, check if the <stdnoreturn.h> header exists, and if found
717	define GCC_NORETURN to _Noreturn rather than either the gcc-specific
718	__attribute__((noreturn)) or an empty token.  Doing this may require
719	calling programs which use GCC_NORETURN in their own function
720	definitions to be modified, because _Noreturn is only accepted as
721	the first token in a declaration.
722
723    --enable-string-hacks
724	Controls whether strlcat and strlcpy may be used.  The same issue
725	applies to OpenBSD's warnings about snprintf, noting that this function
726	is weakly standardized.
727
728	Aside from stifling these warnings, there is no functional improvement
729	in ncurses.
730
731    --enable-symlinks
732	If your system supports symbolic links, make tic use symbolic links
733	rather than hard links to save diskspace when writing aliases in the
734	terminfo database.
735
736    --enable-tcap-names
737	Compile-in support for user-definable terminal capabilities.  Use the
738	-x option of tic and infocmp to treat unrecognized terminal
739	capabilities as user-defined strings.  This option is the default,
740	unless you have disabled the extended functions.
741
742    --enable-term-driver
743	Enable experimental terminal-driver.  This is currently used for the
744	MinGW port, by providing a way to substitute the low-level terminfo
745	library with different terminal drivers.
746
747    --enable-termcap
748	Compile in support for reading terminal descriptions from termcap if no
749	match is found in the terminfo database.  See also the --enable-getcap
750	and --enable-getcap-cache options.
751
752	Termcap support requires run-time parsing rather than loading
753	predigested data.  If you have specified --with-ticlib, then you
754	cannot have termcap support since run-time parsing is done in the
755	tic library, which is intentionally not part of normal linkage
756	dependencies.
757
758    --enable-warnings
759	Turn on GCC compiler warnings.  There should be only a few.
760
761    --enable-wattr-macros
762	The 6.0 ABI adds support for extended colors and for extended mouse.
763	The former is a noticeable problem when developers inadvertently
764	compile using the ncurses6 header files and link with an ncurses5
765	library, because the wattr* macros use a new field in the WINDOW
766	structure.  These macros are used in several applications.
767
768	Since ncurses provides an actual function for each of these macros,
769	suppressing them from the curses.h header allows the ncurses5 libraries
770	to be used in most applications.
771
772	NOTE: The extended colors also are used in the cchar_t structure, but
773	fewer applications use that.
774
775	NOTE: This workaround does not help with mismatches in the ncurses
776	mouse version.  The extended mouse feature uses one less fewer bit for
777	each button, so that only the first button will work as expected with
778	a mismatch between header and library.  Again, most applications will
779	work, since most use only the first button.
780
781    --enable-weak-symbols
782	If the --with-pthread option is set, check if the compiler supports
783	weak-symbols.  If it does, then name the thread-capable library without
784	the "t" (libncurses rather than libncursest), and provide for
785	dynamically loading the pthreads entrypoints at runtime.  This allows
786	one to reduce the number of library files for ncurses.
787
788    --enable-wgetch-events
789	Compile with experimental wgetch-events code.  See ncurses/README.IZ
790
791    --enable-widec
792	Compile with wide-character code.  This makes a different version of
793	the libraries (e.g., libncursesw.so), which stores characters as
794	wide-characters,
795
796	NOTE: applications compiled with this configuration are not compatible
797	with those built for 8-bit characters.  You cannot simply make a
798	symbolic link to equate libncurses.so with libncursesw.so
799
800	NOTE: the Ada95 binding may be built against either version of the the
801	ncurses library, but you must decide which:  the binding installs the
802	same set of files for either version.  Currently (2002/6/22) it does
803	not use the extended features from the wide-character code, so it is
804	probably better to not install the binding for that configuration.
805
806    --enable-xmc-glitch
807	Compile-in support experimental xmc (magic cookie) code.
808
809    --with-abi-version=NUM
810	Override the ABI version, which is used in shared library filenames.
811	Normally this is the same as the release version; some ports have
812	special requirements for compatibility.
813
814	This option does not affect linking with libtool, which uses the
815	release major/minor numbers.
816
817    --with-ada-compiler=CMD
818	Specify the Ada95 compiler command (default "gnatmake")
819
820    --with-ada-include=DIR
821	Tell where to install the Ada includes (default:
822	PREFIX/lib/ada/adainclude)
823
824    --with-ada-libname=NAME
825	Override the name of the Ada binding (default: "AdaCurses")
826
827    --with-ada-objects=DIR
828	Tell where to install the Ada objects (default:  PREFIX/lib/ada/adalib)
829
830    --with-ada-sharedlib
831	Build a shared library for Ada95 binding, if the compiler permits.
832
833	NOTE: You must also set the --with-shared option on some platforms
834	for a successful build.  You need not use this option when you set
835	--with-shared, unless you want to use the Ada shared library.
836
837    --with-bool=TYPE
838	If --without-cxx is specified, override the type used for the "bool"
839	declared in curses.h (normally the type is automatically chosen to
840	correspond with that in <stdbool.h>, or defaults to platform-specific
841	sizes).
842
843    --with-build-cc=XXX
844	If cross-compiling, specify a host C compiler, which is needed to
845	compile a few utilities which generate source modules for ncurses.
846	If you do not give this option, the configure script checks if the
847	$BUILD_CC variable is set, and otherwise defaults to gcc or cc.
848
849    --with-build-cflags=XXX
850	If cross-compiling, specify the host C compiler-flags.  You might need
851	to do this if the target compiler has unusual flags which confuse the
852	host compiler.
853
854	You can also set the environment variable $BUILD_CFLAGS rather than
855	use this option.
856
857    --with-build-cpp=XXX
858	This option is provided by the same macro used for $BUILD_CC, etc.,
859	but is not directly used by ncurses.
860
861    --with-build-cppflags=XXX
862	If cross-compiling, specify the host C preprocessor-flags.  You might
863	need to do this if the target compiler has unusual flags which confuse
864	the host compiler.
865
866	You can also set the environment variable $BUILD_CPPFLAGS rather than
867	use this option.
868
869    --with-build-ldflags=XXX
870	If cross-compiling, specify the host linker-flags.  You might need to
871	do this if the target linker has unusual flags which confuse the host
872	compiler.
873
874	You can also set the environment variable $BUILD_LDFLAGS rather than
875	use this option.
876
877    --with-build-libs=XXX
878	If cross-compiling, the host libraries.  You might need to do this if
879	the target environment requires unusual libraries.
880
881	You can also set the environment variable $BUILD_LIBS rather than
882	use this option.
883
884    --with-caps=XXX
885	Specify an alternate terminfo capabilities file, which makes the
886	configure script look for "include/Caps.XXX".  A few systems, e.g.,
887	AIX 4.x use the same overall file-format as ncurses for terminfo
888	data, but use different alignments within the tables to support
889	legacy applications.  For those systems, you can configure ncurses
890	to use a terminfo database which is compatible with the native
891	applications.
892
893    --with-ccharw-max=XXX
894	Override the size of the wide-character array in cchar_t structures.
895	Changing this will alter the binary interface.  This defaults to 5.
896
897    --with-chtype=TYPE
898	Override type of chtype, which stores the video attributes and (if
899	--enable-widec is not given) a character.  Prior to ncurses 5.5, this
900	was always unsigned long, but with ncurses 5.5, it may be unsigned.
901	Use this option if you need to preserve compatibility with 64-bit
902	executables, e.g., by setting "--with-chtype=long" (the configure
903	script supplies "unsigned").
904
905    --with-config-suffix=XXX
906	Specify a suffix for the ncursesw6-config file, etc., used to work
907	around conflicts with packages.
908
909    --with-cxx-libname=NAME
910	Override the basename of the ncurses++ library (default: "ncurses++")
911
912    --with-cxx-shared
913	When --with-shared is set, build libncurses++ as a shared library.
914	This implicitly relies upon building with gcc/g++, since other
915	compiler suites may have differences in the way shared libraries are
916	built.  libtool by the way has similar limitations.
917
918    --with-database=XXX
919	Specify the terminfo source file to install.  Usually you will wish
920	to install ncurses' default (misc/terminfo.src).  Certain systems
921	have special requirements, e.g, OS/2 EMX has a customized terminfo
922	source file.
923
924    --with-dbmalloc
925	For testing, compile and link with Conor Cahill's dbmalloc library.
926	This also sets the --disable-leaks option.
927
928    --with-debug
929	Generate debug-libraries (default).  These are named by adding "_g"
930	to the root, e.g., libncurses_g.a
931
932    --with-default-terminfo-dir=XXX
933	Specify the default terminfo database directory.  This is normally
934	DATADIR/terminfo, e.g., /usr/share/terminfo.
935
936    --with-dmalloc
937	For testing, compile and link with Gray Watson's dmalloc library.
938	This also sets the --disable-leaks option.
939
940    --with-export-syms[=XXX]
941	Limit exported symbols using libtool.  The configure script
942	automatically chooses an appropriate ".sym" file, which lists the
943	symbols which are part of the ABI.
944
945    --with-extra-suffix[=XXX]
946	Add the given suffix to header- and library-names to simplify
947	installing incompatible ncurses libraries, e.g., those using a
948	different ABI.  The renaming affects the name of the
949	include-subdirectory if --disable-overwrite is given.
950
951    --with-fallbacks=XXX
952	Specify a list of fallback terminal descriptions which will be
953	compiled into the ncurses library.  See CONFIGURING FALLBACK ENTRIES.
954
955	See also "--with-tic-path" and "--with-infocmp-path".
956
957    --with-form-libname=NAME
958	Override the basename of the form library (default: "form")
959
960    --with-gpm
961	use Alessandro Rubini's GPM library to provide mouse support on the
962	Linux console.  Prior to ncurses 5.5, this introduced a dependency on
963	the GPM library.
964
965	Currently ncurses uses the dlsym() function to bind to the library at
966	runtime, so it is only necessary that the library be present when
967	ncurses is built, to obtain the filename (or soname) used in the
968	corresponding dlopen() call.  If you give a value for this option,
969	e.g.,
970
971		--with-gpm=$HOME/tmp/test-gpm.so
972
973	that overrides the configure check for the soname.
974
975	See also --without-dlsym
976
977    --with-hashed-db[=XXX]
978	Use a hashed database for storing terminfo data rather than storing
979	each compiled entry in a separate binary file within a directory
980	tree.
981
982	In particular, this uses the Berkeley database 1.8.5 interface, as
983	provided by that and its successors db 2, 3, and 4.  The actual
984	interface is slightly different in the successor versions of the
985	Berkeley database.  The database should have been configured using
986	"--enable-compat185".
987
988	If you use this option for configuring ncurses, tic will only be able
989	to write entries in the hashed database.  infocmp can still read
990	entries from a directory tree as well as reading entries from the
991	hashed database.  To do this, infocmp determines whether the $TERMINFO
992	variable points to a directory or a file, and reads the directory-tree
993	or hashed database respectively.
994
995	You cannot have a directory containing both hashed-database and
996	filesystem-based terminfo entries.
997
998	Use the parameter value to give the install-prefix used for the
999	database, e.g.,
1000		--with-hashed-db=/usr/local/BigBase
1001	to find the corresponding include- and lib-directories under the
1002	given directory.  Alternatively, you can specify a directory leaf
1003	name, e.g.,
1004		--with-hashed-db=db4
1005	to make the configure script look for files in a subdirectory such as
1006		/usr/include/db4/db.h
1007		/usr/lib/db4/libdb.so
1008
1009	See also the --enable-getcap option.
1010
1011    --with-infocmp-path[=XXX]
1012	Use this option to override the automatic detection of tic in your
1013	$PATH when building fallbacks (see "--with-fallbacks").
1014
1015    --with-install-prefix=XXX
1016	Allows you to specify an alternate location for installing ncurses
1017	after building it.  The value you specify is prepended to the "real"
1018	install location.  This simplifies making binary packages.  The
1019	makefile variable DESTDIR is set by this option.  It is also possible
1020	to use
1021		make install DESTDIR=XXX
1022	since the makefiles pass that variable to subordinate makes.
1023
1024	NOTE: a few systems build shared libraries with fixed pathnames; this
1025	option probably will not work for those configurations.
1026
1027    --with-lib-prefix=XXX
1028	OS/2 EMX used a different naming convention from most Unix-like
1029	platforms.  It required that the "lib" part of a library name was
1030	omitted.  Newer EMX as part of eComStation does not follow that
1031	convention.  Use this option to override the configure script's
1032	assumptions about the library-prefix.  If this option is omitted, it
1033	uses the original OS/2 EMX convention for that platform.  Use
1034	"--with-lib-prefix=lib" for the newer EMX in eComStation.  Use
1035	"--without-lib-prefix" to suppress it for other odd platforms.
1036
1037    --with-libtool[=XXX]
1038	Generate libraries with libtool.  If this option is selected, then it
1039	overrides all other library model specifications.  Note that libtool
1040	must already be installed, uses makefile rules dependent on GNU make,
1041	and does not promise to follow the version numbering convention of
1042	other shared libraries on your system.  However, if the --with-shared
1043	option does not succeed, you may get better results with this option.
1044
1045	If a parameter value is given, it must be the full pathname of the
1046	particular version of libtool, e.g.,
1047		/usr/bin/libtool-1.2.3
1048
1049	It is possible to rebuild the configure script to use the automake
1050	macros for libtool, e.g., AC_PROG_LIBTOOL.  See the comments in
1051	aclocal.m4 for CF_PROG_LIBTOOL, and ensure that you build configure
1052	using the appropriate patch for autoconf from
1053		https://invisible-island.net/autoconf/
1054
1055    --with-libtool-opts=XXX
1056	Allow user to pass additional libtool options into the library creation
1057	and link steps.  The main use for this is to do something like
1058		./configure --with-libtool-opts=-static
1059	to get the same behavior as automake-flavored
1060		./configure --enable-static
1061
1062    --with-manpage-aliases
1063	Tell the configure script you wish to create entries in the
1064	man-directory for aliases to manpages which list them, e.g., the
1065	functions in the panel manpage.  This is the default.  You can disable
1066	it if your man program does this.  You can also disable
1067	--with-manpage-symlinks to install files containing a ".so" command
1068	rather than symbolic links.
1069
1070    --with-manpage-format=XXX
1071	Tell the configure script how you would like to install man-pages.  The
1072	option value must be one of these:  gzip, compress, BSDI, normal,
1073	formatted.  If you do not give this option, the configure script
1074	attempts to determine which is the case.
1075
1076    --with-manpage-renames=XXX
1077	Tell the configure script that you wish to rename the manpages while
1078	installing.  Currently the only distribution which does this is Debian.
1079	The option value specifies the name of a file that lists the renamed
1080	files, e.g., $srcdir/man/man_db.renames
1081
1082    --with-manpage-symlinks
1083	Tell the configure script that you wish to make symbolic links in the
1084	man-directory for aliases to the man-pages.  This is the default, but
1085	can be disabled for systems that provide this automatically.  Doing
1086	this on systems that do not support symbolic links will result in
1087	copying the man-page for each alias.
1088
1089    --with-manpage-tbl
1090	Tell the configure script that you wish to preprocess the manpages
1091	by running them through tbl to generate tables understandable by
1092	nroff.
1093
1094    --with-menu-libname=NAME
1095	Override the basename of the menu library (default: "menu")
1096
1097    --with-mmask-t=TYPE
1098	Override type of mmask_t, which stores the mouse mask.  Prior to
1099	ncurses 5.5, this was always unsigned long, but with ncurses 5.5, it
1100	may be unsigned.  Use this option if you need to preserve compatibility
1101	with 64-bit executables.
1102
1103    --with-normal
1104	Generate normal (i.e., static) libraries (default).
1105
1106	Note:  on Linux, the configure script will attempt to use the GPM
1107	library via the dlsym() function call.  Use --without-dlsym to disable
1108	this feature, or --without-gpm, depending on whether you wish to use
1109	GPM.
1110
1111    --with-ospeed=TYPE
1112	Override type of ospeed variable, which is part of the termcap
1113	compatibility interface.  In termcap, this is a 'short', which works
1114	for a wide range of baudrates because ospeed is not the actual speed
1115	but the encoded value, e.g., B9600 would be a small number such as 13.
1116	However the encoding scheme originally allowed for values "only" up to
1117	38400bd.  A newer set of definitions past 38400bd is not encoded as
1118	compactly, and is not guaranteed to fit into a short (see the function
1119	cfgetospeed(), which returns a speed_t for this reason).  In practice,
1120	applications that required knowledge of the ospeed variable, i.e.,
1121	those using termcap, do not use the higher speeds.  Your application
1122	(or system, in general) may or may not.
1123
1124    --with-panel-libname=NAME
1125	Override the basename of the panel library (default: "panel")
1126
1127    --with-pc-suffix=SUFFIX
1128	If ".pc" files are installed, optionally add a suffix to the files
1129	and corresponding package names to separate unusual configurations.
1130	If no option value is given (or if it is "none"), no suffix is added.
1131
1132    --with-pcre2
1133	Add PCRE2 (Perl-compatible regular expressions v2) to the build if it
1134	is available and the user requests it.  Assume the application will
1135	otherwise use the POSIX interface.
1136
1137	This is useful for MinGW builds because the usual POSIX interface is
1138	not supplied by the development environment, while ncurses' form
1139	library uses a regular expression feature for one of the field types.
1140
1141    --with-pkg-config=[DIR]
1142	Check for pkg-config, optionally specifying its path.
1143
1144    --with-pkg-config-libdir=[DIR]
1145	If pkg-config was found, override the automatic check for its library
1146	path.  The configure script allows only a single directory, because
1147	that is used as the directory in which to install ".pc" files.
1148
1149	The automatic check for the library path selects the first directory
1150	which currently exists.
1151
1152    --with-profile
1153	Generate profile-libraries These are named by adding "_p" to the root,
1154	e.g., libncurses_p.a
1155
1156    --with-pthread
1157	Link with POSIX threads, set --enable-reentrant.  The use_window() and
1158	use_screen() functions will use mutex's, allowing rudimentary support
1159	for multithreaded applications.
1160
1161    --with-rcs-ids
1162	Compile-in RCS identifiers.  Most of the C files have an identifier.
1163
1164    --with-rel-version=NUM
1165	Override the release version, which may be used in shared library
1166	filenames.  This consists of a major and minor version number separated
1167	by ".".  Normally the major version number is the same as the ABI
1168	version; some ports have special requirements for compatibility.
1169
1170    --with-shared
1171	Generate shared-libraries.  The names given depend on the system for
1172	which you are building, typically using a ".so" suffix, along with
1173	symbolic links that refer to the release version.
1174
1175	NOTE: Unless you override the configure script by setting the $CFLAGS
1176	environment variable, these will not be built with the -g debugging
1177	option.
1178
1179	NOTE: For some configurations, e.g., installing a new version of
1180	ncurses shared libraries on a machine which already has ncurses
1181	shared libraries, you may encounter problems with the linker.
1182	For example, it may prevent you from running  the build tree's
1183	copy of tic (for installing the terminfo database) because it
1184	loads the system's copy of the ncurses shared libraries.
1185
1186	In that case, using the misc/shlib script may be helpful, since it
1187	sets $LD_LIBRARY_PATH to point to the build tree, e.g.,
1188
1189		./misc/shlib make install
1190
1191	Alternatively, for most platforms, the linker accepts a list of
1192	directories which will be searched for libraries at run-time.  The
1193	configure script allows you to modify this list using the
1194	RPATH_LIST environment variable.  It is a colon-separated list of
1195	directories (default:  the "libdir" set via the configure script).
1196	If you set that to put "../lib" first in the list, the linker will
1197	look first at the build-directory, and avoid conflict with libraries
1198	already installed.  One drawback to this approach is that libraries
1199	can be accidentally searched in any "../lib" directory.
1200
1201	NOTE: If you use the --with-ada-sharedlib option, you should also
1202	set this option, to ensure that C-language modules needed for the
1203	Ada binding use appropriate compiler options.
1204
1205    --with-shlib-version=XXX
1206	Specify whether to use the release or ABI version for shared libraries.
1207	This is normally chosen automatically based on the type of system
1208	which you are building on.  We use it for testing the configure script.
1209
1210    --with-sysmouse
1211	use FreeBSD sysmouse interface provide mouse support on the console.
1212
1213    --with-system-type=XXX
1214	For testing, override the derived host system-type which is used to
1215	decide things such as the linker commands used to build shared
1216	libraries.  This is normally chosen automatically based on the type of
1217	system which you are building on.  We use it for testing the configure
1218	script.
1219
1220    --with-terminfo-dirs=XXX
1221	Specify a search-list of terminfo directories which will be compiled
1222	into the ncurses library (default: DATADIR/terminfo)
1223
1224	This is a colon-separated list, like the TERMINFO_DIRS environment
1225	variable.
1226
1227    --with-termlib[=XXX]
1228	When building the ncurses library, organize this as two parts:  the
1229	curses library (libncurses) and the low-level terminfo library
1230	(libtinfo).  This is done to accommodate applications that use only
1231	the latter.  The terminfo library is about half the size of the total.
1232
1233	If an option value is given, that overrides the name of the terminfo
1234	library.  For instance, if the wide-character version is built, the
1235	terminfo library would be named libtinfow.  But the libtinfow interface
1236	is upward compatible from libtinfo, so it would be possible to overlay
1237	libtinfo.so with a "wide" version of libtinfow.so by renaming it with
1238	this option.
1239
1240    --with-termpath=XXX
1241	Specify a search-list of termcap files which will be compiled into the
1242	ncurses library (default:  /etc/termcap:/usr/share/misc/termcap)
1243
1244    --with-tic-path[=XXX]
1245	Use this option to override the automatic detection of tic in your
1246	$PATH when building fallbacks (see "--with-fallbacks").
1247
1248    --with-ticlib[=XXX]
1249	When building the ncurses library, build a separate library for
1250	the modules that are used only by the utility programs.  Normally
1251	those would be bundled with the termlib or ncurses libraries.
1252
1253	If an option value is given, that overrides the name of the tic
1254	library.  As in termlib, there is no ABI difference between the
1255	"wide" libticw.so and libtic.so
1256
1257	NOTE: Overriding the name of the tic library may be useful if you are
1258	also using the --with-termlib option to rename libtinfo.  If you are
1259	not doing that, renaming the tic library can result in conflicting
1260	library dependencies for tic and other programs built with the tic
1261	library.
1262
1263    --with-tparm-arg[=XXX]
1264	Override the type used for tparm() arguments, which normally is a
1265	"long".  However the function must assume that its arguments can hold a
1266	pointer to char's which is not always workable for 64-bit platforms.  A
1267	better choice would be intptr_t, which was not available at the time
1268	tparm's interface was defined.
1269
1270	If the option is not given, this defaults to "long".
1271
1272    --with-trace
1273	Configure the trace() function as part of the all models of the ncurses
1274	library.  Normally it is part of the debug (libncurses_g) library only.
1275
1276    --with-valgrind
1277	For testing, compile with debug option.
1278	This also sets the --disable-leaks option.
1279
1280    --with-versioned-syms[=XXX]
1281	The Solaris, GNU and reportedly some other linkers (ld) accept a
1282	"--version-script" option which tells the linker to annotate the
1283	resulting objects with version identifiers.
1284
1285	Use "objdump -T" on a library to see the annotations.
1286
1287	The configure script attempts to automatically apply a suitable ".map"
1288	file to provide this information for Linux.  Solaris mapfiles differ:
1289
1290	a) comments are not accepted
1291	b) wildcards are not accepted, except for a special case of "_*".
1292	c) each symbol listed in the map file must exist in the library
1293
1294	The Solaris limitations conflict with the development goal of providing
1295	a small set of ".map" files as examples, which cover the most common
1296	configurations.  Because that coverage is done by merging together
1297	several builds, some symbols will be listed in the the ".map" files
1298	that do not happen to be present in one configuration or another.
1299
1300	The sample ".map" (and ".sym") files are generated using a set of
1301	scripts which build several configurations for each release version,
1302	checking to see which of the "_nc_" symbols can be made local.  In
1303	addition to the ncurses libraries and programs, the symbols used
1304	by the "tack" program before version 1.08 are made global.
1305
1306	These sample ".map" files will not cover all possible combinations.
1307	In some cases, e.g., when using the --with-weak-symbols option, you
1308	may prefer to use a different ".map" file by setting this option's
1309	value.
1310
1311    --with-wrap-prefix=XXX
1312	When using the --enable-reentrant option, ncurses redefines variables
1313	that would be global in curses, e.g., LINES, as a macro that calls a
1314	"wrapping" function which fetches the data from the current SCREEN
1315	structure.  Normally that function is named by prepending "_nc_" to the
1316	variable's name.  The function is technically private (since portable
1317	applications would not refer directly to it).  But according to one
1318	line of reasoning, it is not the same type of "private" as functions
1319	which applications should not call even via a macro.  This configure
1320	option lets you choose the prefix for these wrapped variables.
1321
1322    --with-x11-rgb=FILE
1323	Provide a pathname for the X11 rgb file, used by the picsmap program.
1324	This overrides a configure check which usually works, but is needed
1325	due to the lack of standardization for X11's files.
1326
1327    --with-xterm-kbs=XXX
1328	Configure xterm's terminfo entries to use either BS (^H, i.e., ASCII
1329	backspace) or DEL (^?, or 127).  XXX can be BS (or bs, 8) or DEL
1330	(or del, 127).
1331
1332	During installation, the makefile and scripts modifies the "xterm+kbs"
1333	terminfo entry to use this setting.
1334
1335    --without-ada
1336	Suppress the configure script's check for Ada95, do not build the
1337	Ada95 binding and related demo.
1338
1339    --without-curses-h
1340	Don't install the ncurses header with the name "curses.h".  Rather,
1341	install as "ncurses.h" and modify the installed headers and manpages
1342	accordingly.
1343
1344	Likewise, do not install an alias "curses" for the ncurses manpage.
1345
1346    --without-cxx
1347	XSI curses declares "bool" as part of the interface.  C++ also declares
1348	"bool".  Neither specifies the size and type of booleans, but both
1349	insist on the same name.  We chose to accommodate this by making the
1350	configure script check for the size and type (e.g., unsigned or signed)
1351	that your C++ compiler uses for booleans.  If you do not wish to use
1352	ncurses with C++, use this option to tell the configure script to not
1353	adjust ncurses bool to match C++.
1354
1355    --without-cxx-binding
1356	Suppress the configure script's check for C++, do not build the
1357	C++ binding and related demo.
1358
1359    --without-develop
1360	Disable development options.  This does not include those that change
1361	the interface, such as --enable-widec.
1362
1363    --without-dlsym
1364	Do not use dlsym() to load GPM dynamically.
1365
1366    --without-manpages
1367	Tell the configure script to suppress the install of ncurses' manpages.
1368
1369    --without-progs
1370	Tell the configure script to suppress the build of ncurses' application
1371	programs (e.g., tic).  The test applications will still be built if you
1372	type "make", though not if you simply do "make install".
1373
1374    --without-tack
1375	Suppress build/install with tack program, if it happens to be
1376	in the same build-tree (tack was moved out of the ncurses source-tree
1377	in 20070203).
1378
1379    --without-tests
1380	Tell the configure script to suppress the build of ncurses' test
1381	programs.
1382
1383    --without-xterm-new
1384	Tell the configure script to use "xterm-old" for the entry used in
1385	the terminfo database.  This will work with variations such as
1386	X11R5 and X11R6 xterm.
1387
1388
1389COMPATIBILITY WITH OLDER RELEASES:
1390---------------------------------
1391
1392    Because ncurses implements X/Open Curses, its interface is fairly stable.
1393    That does not mean the interface does not change.  Changes are made to the
1394    documented interfaces when we find differences between ncurses and X/Open
1395    or implementations which largely correspond to X/Open (such as Solaris).
1396    We add extensions to those interfaces to solve problems not addressed by
1397    the original curses design, but those must not conflict with the X/Open
1398    documentation.
1399
1400    Here are some of the major interface changes, and related problems which
1401    you may encounter when building a system with different versions of
1402    ncurses:
1403
1404    6.3 (Oct 21, 2021)
1405	Interface changes:
1406
1407	+ the definition of TERMTYPE2 is now internal, not visible in the ABI,
1408	  like the enclosing TERMINAL which was previously made opaque.  This
1409	  was done to provide SCREEN-specific "static" variables in terminfo.
1410
1411	Added extensions:
1412
1413	+ add sp-funcs for erasewchar, killwchar.
1414
1415	Added internal functions (other than "_sp" variants):
1416
1417	+ _nc_safe_fopen and _nc_safe_open3 limit privileges if possible when
1418	  opening a file; otherwise disallow access for updating files.
1419
1420	+ _nc_tiparm is a variant of tiparm which is used when all of the
1421	  parameters are known to be numbers rather than possibly strings.
1422
1423	+ _nc_reset_tparm improves tic's checks by resetting the terminfo
1424	  "static variables" before calling functions which may update them.
1425
1426	Removed internal functions:
1427
1428	+ none
1429
1430	Modified internal functions:
1431
1432	+ _nc_trace_ttymode passes pointer to const data
1433
1434	+ _nc_tparm_analyze passes pointer to int*, not int[]
1435
1436    6.2 (Feb 12, 2020)
1437	Interface changes:
1438
1439	+ the terminal database must be compiled with ncurses 6.2 tic;
1440	  older versions of tic/infocmp will not work.  Aside from that,
1441	  the compiled database will work with older applications.
1442
1443	+ "*.pc" and "ncurses*-config" files give the same information.
1444
1445	+ vwprintw and vwscanw are deprecated.
1446
1447	Added extensions:
1448
1449	+ These make it simpler to substitute a debug-configuration of the
1450	  library for non-debug:
1451		curses_trace
1452		exit_curses
1453		exit_terminfo
1454
1455	Added internal functions (other than "_sp" variants):
1456
1457	+ These provide fast-lookup of common user-defined capabilities:
1458		_nc_find_user_entry
1459		_nc_get_userdefs_table
1460		_nc_get_hash_user
1461
1462	+ This is added to work around compiler-warnings:
1463		_nc_fmt_funcptr
1464
1465	Removed internal functions:
1466
1467	+ _nc_import_termtype
1468
1469	Modified internal functions:
1470
1471	+ _nc_reserve_pairs no longer returns a value
1472
1473    6.1 (Jan 27, 2018)
1474	Interface changes:
1475
1476	+ X/Open Curses specifies a "reserved" void* parameter in several
1477	  functions, saying that it must be NULL.  In this release, if the
1478	  parameter is non-NULL, it is interpreted as a point to an integer
1479	  containing a color pair.  In previous releases, a non-NULL parameter
1480	  caused an error return.  Portable applications are unaffected.  Here
1481	  are the functions which have been extended:
1482		attr_get
1483		attr_off
1484		attr_on
1485		attr_set
1486		chgat
1487		color_set
1488		mvchgat
1489		mvwchgat
1490		slk_attr_off
1491		slk_attr_on
1492		slk_attr_set
1493		wattr_get
1494		wattr_on
1495		wattr_off
1496		wattr_set
1497		wchgat
1498		wcolor_set
1499
1500	+ the TERMINAL structure declared in <term.h> has been made opaque,
1501	  and its size increased to handle the increased size of color pair
1502	  and color value, as well as other numeric capabilities.
1503
1504	  A few applications required change, e.g., to use def_prog_mode;
1505	  only one application (tack) is known to have a valid reason for
1506	  accessing these internal details, and that was addressed by the
1507	  release of tack 1.08 in 2017.  Internal functions marked as used
1508	  by tack will be deprecated in future releases.
1509
1510	Added extensions:
1511
1512	+ Several new functions were added to manipulate extended color pairs
1513	  and color values.  These include:
1514		alloc_pair
1515		extended_color_content
1516		extended_pair_content
1517		extended_slk_color
1518		find_pair
1519		free_pair
1520		init_extended_color
1521		init_extended_pair
1522		reset_color_pairs
1523
1524	  as well as corresponding sp-functions.
1525
1526	+ A new terminfo capability "RGB" tells the ncurses library that the
1527	  color values are red/green/blue, to eliminate the need for palettes
1528	  in that special case for the color_content function.
1529
1530	Added internal functions (other than "_sp" variants):
1531		_nc_copy_termtype2
1532		_nc_export_termtype2
1533		_nc_fallback2
1534		_nc_find_prescr
1535		_nc_forget_prescr
1536		_nc_free_termtype2
1537		_nc_read_entry2
1538		_nc_write_object
1539
1540	Removed internal functions:
1541		_nc_check_termtype
1542		_nc_resolve_uses
1543
1544	Modified internal functions:
1545
1546	+ symbols are used by tic/infocmp/toe:
1547		_nc_align_termtype - change parameters to TERMTYPE2*
1548		_nc_check_termtype2 - change parameter to TERMTYPE2*
1549		_nc_read_file_entry - change parameter to TERMTYPE2*
1550		_nc_read_termtype - change parameter to TERMTYPE2*
1551		_nc_trim_sgr0 - change parameter to TERMTYPE2*
1552		_nc_write_entry - change parameter to TERMTYPE2*
1553
1554	+ symbols used only within the library:
1555		_nc_fallback - change return type to TERMTYPE2*
1556		_nc_init_termtype - change parameter to TERMTYPE2*
1557
1558    6.0 (Aug 08, 2015)
1559	Interface changes:
1560
1561	+ The 6.0 ABI modifies the defaults for these configure options:
1562	   --enable-const
1563	   --enable-ext-colors
1564	   --enable-ext-mouse
1565	   --enable-ext-putwin
1566	   --enable-interop
1567	   --enable-lp64
1568	   --enable-sp-funcs
1569	   --with-chtype=uint32_t
1570	   --with-mmask_t=uint32_t
1571	   --with-tparm-arg=intptr_t
1572
1573	+ ncurses supports symbol versioning.  If you use this feature, about
1574	  half of the "_nc_" private symbols are changed to local symbols.
1575
1576	+ a few applications may need to explicitly flush the standard output
1577	  when switching between printf's and (curses) printw.
1578
1579	Added extensions:
1580
1581	+ use_tioctl is an improvement over use_env
1582
1583	+ added wgetdelay to support the NCURSES_OPAQUE feature.
1584
1585	Added internal functions (other than "_sp" variants):
1586		_nc_init_termtype
1587		_nc_mvcur
1588		_nc_putchar
1589		_nc_setenv_num
1590		_nc_trace_mmask_t
1591
1592	Removed internal functions:
1593		none
1594
1595	Modified internal functions:
1596		_nc_do_color - change parameters from short/bool to int
1597		_nc_keypad - change parameter from bool to int
1598		_nc_setupscreen - change parameter from bool to int
1599		_nc_signal_handler - change parameter from bool to int
1600
1601    5.9 (Apr 04, 2011)
1602    5.8 (Feb 26, 2011)
1603	Interface changes:
1604
1605	+ add an alternate library configuration, i.e., "terminal driver" to
1606	  support port to Windows, built with MinGW.  There are two drivers
1607	  (terminfo and Windows console).  The terminfo driver works on other
1608	  platforms.
1609
1610	+ add a new set of functions which accept a SCREEN* parameter, in
1611	  contrast with the original set which use the global value "sp".
1612	  By default, these names end with "_sp", and are otherwise
1613	  functionally identical with the originals.
1614
1615	  In addition to the "_sp" functions, there are a few new functions
1616	  associated with this feature:  ceiling_panel, ground_panel,
1617	  new_prescr.
1618
1619	  If the library is not built with the sp-funcs extension, there
1620	  are no related interface changes.
1621
1622	+ add tiparm function based on review of X/Open Curses Issue 7.
1623
1624	+ change internal _nc_has_mouse function to public has_mouse function
1625
1626	Added extensions:
1627
1628	+ add a few more functions to support the NCURSES_OPAQUE feature:
1629	  get_escdelay, is_pad, is_subwin
1630
1631	Added internal functions (other than "_sp" variants):
1632		_nc_curscr_of
1633		_nc_format_slks
1634		_nc_get_alias_table
1635		_nc_get_hash_info
1636		_nc_insert_wch
1637		_nc_newscr_of
1638		_nc_outc_wrapper
1639		_nc_retrace_char
1640		_nc_retrace_int_attr_t
1641		_nc_retrace_mmask_t
1642		_nc_setup_tinfo
1643		_nc_stdscr_of
1644		_nc_tinfo_cmdch
1645
1646	Removed internal functions:
1647		_nc_makenew (some configurations replace by _nc_makenew_sp)
1648
1649	Modified internal functions:
1650		_nc_UpdateAttrs
1651		_nc_get_hash_table
1652		_nc_has_mouse
1653		_nc_insert_ch
1654		_nc_wgetch
1655
1656    5.7 (November 2, 2008)
1657	Interface changes:
1658
1659	+ generate linkable stubs for some macros:
1660		getattrs
1661
1662	+ Add new library configuration for tic-library (the non-curses portion
1663	  of the ncurses library used for the tic program as well as some
1664	  others such as tack.  There is no API change, but makefiles would be
1665	  changed to use the tic-library built separately.
1666
1667	  tack, distributed separately from ncurses, uses some of the internal
1668	  _nc_XXX functions, which are declared in the tic.h header file.
1669
1670	  The reason for providing this separate library is that none of the
1671	  functions in it are suitable for threaded applications.
1672
1673	+ Add new library configuration (ncursest, ncurseswt) which provides
1674	  rudimentary support for POSIX threads.  This introduces opaque
1675	  access functions to the WINDOW structure and adds a parameter to
1676	  several internal functions.
1677
1678	+ move most internal variables (except tic-library) into data blocks
1679	  _nc_globals and _nc_prescreen to simplify analysis.  Those were
1680	  globally accessible, but since they were not part of the documented
1681	  API, there is no ABI change.
1682
1683	+ changed static tables of strings to be indices into long strings, to
1684	  improve startup performance.  This changes parameter lists for some
1685	  of the internal functions.
1686
1687	Added extensions:
1688
1689	+ add NCURSES_OPAQUE definition in curses.h to control whether internal
1690	  details of the WINDOW structure are visible to an application.  This
1691	  is always defined when the threaded library is built, and is optional
1692	  otherwise.  New functions for this:  is_cleared, is_idcok, is_idlok,
1693	  is_immedok, is_keypad, is_leaveok, is_nodelay, is_notimeout,
1694	  is_scrollok, is_syncok, wgetparent and wgetscrreg.
1695
1696	+ the threaded library (ncursest) also disallows direct updating of
1697	  global curses-level variables, providing functions (via macros) for
1698	  obtaining their value.  A few of those variables can be modified by
1699	  the application, using new functions:  set_escdelay, set_tabsize
1700
1701	+ added functions use_window() and use_screen() which wrap a mutex
1702	  (if threading is configured) around a call to a user-supplied
1703	  function.
1704
1705	Added internal functions:
1706		_nc_get_alias_table
1707		_nc_get_screensize
1708		_nc_keyname
1709		_nc_screen_of
1710		_nc_set_no_padding
1711		_nc_tracechar
1712		_nc_tracemouse
1713		_nc_unctrl
1714		_nc_ungetch
1715
1716		These are used for leak-testing, and are stubs for
1717		ABI compatibility when ncurses is not configured for that
1718		using the --disable-leaks configure script option:
1719
1720		_nc_free_and_exit
1721		_nc_leaks_tinfo
1722
1723	Removed internal functions:
1724		none
1725
1726	Modified internal functions:
1727		_nc_fifo_dump
1728		_nc_find_entry
1729		_nc_handle_sigwinch
1730		_nc_init_keytry
1731		_nc_keypad
1732		_nc_locale_breaks_acs
1733		_nc_timed_wait
1734		_nc_update_screensize
1735
1736		Use new typedef TRIES to replace "struct tries":
1737
1738		_nc_add_to_try
1739		_nc_expand_try
1740		_nc_remove_key
1741		_nc_remove_string
1742		_nc_trace_tries
1743
1744    5.6 (December 17, 2006)
1745	Interface changes:
1746
1747	+ generate linkable stubs for some macros:
1748
1749	  getbegx, getbegy, getcurx, getcury, getmaxx, getmaxy, getparx,
1750	  getpary, getpary,
1751
1752	  and (for libncursesw)
1753
1754	  wgetbkgrnd
1755
1756	Added extensions:
1757		nofilter()
1758		use_legacy_coding()
1759
1760	Added internal functions:
1761		_nc_first_db
1762		_nc_get_source
1763		_nc_handle_sigwinch
1764		_nc_is_abs_path
1765		_nc_is_dir_path
1766		_nc_is_file_path
1767		_nc_keep_tic_dir
1768		_nc_keep_tic_dir
1769		_nc_last_db
1770		_nc_next_db
1771		_nc_read_termtype
1772		_nc_tic_dir
1773
1774		Also (if using the hashed database configuration):
1775
1776		_nc_db_close
1777		_nc_db_first
1778		_nc_db_get
1779		_nc_db_have_data
1780		_nc_db_have_index
1781		_nc_db_next
1782		_nc_db_open
1783		_nc_db_put
1784
1785		otherwise
1786
1787		_nc_hashed_db
1788
1789	Removed internal functions:
1790		none
1791
1792	Modified internal functions:
1793		_nc_add_to_try
1794		_nc_do_color
1795		_nc_expand_try
1796		_nc_remove_key
1797		_nc_setupscreen
1798
1799    5.5 (October 10, 2005)
1800	Interface changes:
1801
1802	+ terminfo installs "xterm-new" as "xterm" entry rather than
1803	  "xterm-old" (aka xterm-r6).
1804
1805	+ terminfo data is installed using the tic -x option (few systems
1806	  still use ncurses 4.2).
1807
1808	+ modify C++ binding to work with newer C++ compilers by providing
1809	  initializers and using modern casts.  Old-style header names are
1810	  still used in this release to allow compiling with not-so-old
1811	  compilers.
1812
1813	+ form and menu libraries now work with wide-character data.
1814	  Applications which bypassed the form library and manipulated the
1815	  FIELD.buf data directly will not work properly with libformw, since
1816	  that no longer points to an array of char.  The set_field_buffer()
1817	  and field_buffer() functions translate to/from the actual field
1818	  data.
1819
1820	+ change SP->_current_attr to a pointer, adjust ifdef's to ensure that
1821	  libtinfo.so and libtinfow.so have the same ABI.  The reason for this
1822	  is that the corresponding data which belongs to the upper-level
1823	  ncurses library has a different size in each model.
1824
1825	+ winnstr() now returns multibyte character strings for the
1826	  wide-character configuration.
1827
1828	+ assume_default_colors() no longer requires that use_default_colors()
1829	  be called first.
1830
1831	+ data_ahead() now works with wide-characters.
1832
1833	+ slk_set() and slk_wset() now accept and store multibyte or
1834	  multicolumn characters.
1835
1836	+ start_color() now returns OK if colors have already been started.
1837	  start_color() also returns ERR if it cannot allocate memory.
1838
1839	+ pair_content() now returns -1 for consistency with init_pair() if it
1840	  corresponds to the default-color.
1841
1842	+ unctrl() now returns null if its parameter does not correspond
1843	  to an unsigned char.
1844
1845	Added extensions:
1846		Experimental mouse version 2 supports wheel mice with buttons
1847		4 and 5.  This requires ABI 6 because it modifies the encoding
1848		of mouse events.
1849
1850		Experimental extended colors allows encoding of 256 foreground
1851		and background colors, e.g., with the xterm-256color or
1852		xterm-88color terminfo entries.  This requires ABI 6 because
1853		it changes the size of cchar_t.
1854
1855	Added internal functions:
1856		_nc_check_termtype2
1857		_nc_resolve_uses2
1858		_nc_retrace_cptr
1859		_nc_retrace_cvoid_ptr
1860		_nc_retrace_void_ptr
1861		_nc_setup_term
1862
1863	Removed internal functions:
1864		none
1865
1866	Modified internal functions:
1867		_nc_insert_ch
1868		_nc_save_str
1869		_nc_trans_string
1870
1871    5.4 (February 8, 2004)
1872	Interface changes:
1873
1874	+ add the remaining functions for X/Open curses wide-character support.
1875	  These are only available if the library is configured using the
1876	  --enable-widec option.
1877		pecho_wchar()
1878		slk_wset()
1879
1880	+ write getyx() and related 2-return macros in terms of getcury(),
1881	  getcurx(), etc.
1882
1883	+ simplify ifdef for bool declaration in curses.h
1884
1885	+ modify ifdef's in curses.h that disabled use of __attribute__() for
1886	  g++, since recent versions implement the cases which ncurses uses.
1887
1888	+ change some interfaces to use const:
1889		define_key()
1890		mvprintw()
1891		mvwprintw()
1892		printw()
1893		vw_printw()
1894		winsnstr()
1895		wprintw()
1896
1897	Added extensions:
1898		key_defined()
1899
1900	Added internal functions:
1901		_nc_get_locale()
1902		_nc_insert_ch()
1903		_nc_is_charable()	wide
1904		_nc_locale_breaks_acs()
1905		_nc_pathlast()
1906		_nc_to_char()		wide
1907		_nc_to_widechar()	wide
1908		_nc_tparm_analyze()
1909		_nc_trace_bufcat()	debug
1910		_nc_unicode_locale()
1911
1912	Removed internal functions:
1913		_nc_outstr()
1914		_nc_sigaction()
1915
1916	Modified internal functions:
1917		_nc_remove_string()
1918		_nc_retrace_chtype()
1919
1920    5.3 (October 12, 2002)
1921	Interface changes:
1922
1923	+ change type for bool used in headers to NCURSES_BOOL, which usually
1924	  is the same as the compiler's definition for 'bool'.
1925
1926	+ add all but two functions for X/Open curses wide-character support.
1927	  These are only available if the library is configured using the
1928	  --enable-widec option.  Missing functions are
1929		pecho_wchar()
1930		slk_wset()
1931
1932	+ add environment variable $NCURSES_ASSUMED_COLORS to modify the
1933	  assume_default_colors() extension.
1934
1935	Added extensions:
1936		is_term_resized()
1937		resize_term()
1938
1939	Added internal functions:
1940		_nc_altcharset_name()	debug
1941		_nc_reset_colors()
1942		_nc_retrace_bool()	debug
1943		_nc_retrace_unsigned()	debug
1944		_nc_rootname()
1945		_nc_trace_ttymode()	debug
1946		_nc_varargs()		debug
1947		_nc_visbufn()		debug
1948		_nc_wgetch()
1949
1950	Removed internal functions:
1951		_nc_background()
1952
1953	Modified internal functions:
1954		_nc_freeall()		debug
1955
1956    5.2 (October 21, 2000)
1957	Interface changes:
1958
1959	+ revert termcap ospeed variable to 'short' (see discussion of the
1960	  --with-ospeed configure option).
1961
1962    5.1 (July 8, 2000)
1963	Interface changes:
1964
1965	+ made the extended terminal capabilities
1966	  (configure --enable-tcap-names) a standard feature.  This should
1967	  be transparent to applications that do not require it.
1968
1969	+ removed the trace() function and related trace support from the
1970	  production library.
1971
1972	+ modified curses.h.in, undef'ing some symbols to avoid conflict
1973	  with C++ STL.
1974
1975	Added extensions:  assume_default_colors().
1976
1977    5.0 (October 23, 1999)
1978	Interface changes:
1979
1980	+ implemented the wcolor_set() and slk_color() functions.
1981
1982	+ move macro winch to a function, to hide details of struct ldat
1983
1984	+ corrected prototypes for slk_* functions, using chtype rather than
1985	  attr_t.
1986
1987	+ the slk_attr_{set,off,on} functions need an additional void*
1988	  parameter according to XSI.
1989
1990	+ modified several prototypes to correspond with 1997 version of X/Open
1991	  Curses:  [w]attr_get(), [w]attr_set(), border_set() have different
1992	  parameters.  Some functions were renamed or misspelled:
1993	  erase_wchar(), in_wchntr(), mvin_wchntr().  Some developers have used
1994	  attr_get().
1995
1996	Added extensions:  keybound(), curses_version().
1997
1998	Terminfo database changes:
1999
2000	+ change translation for termcap 'rs' to terminfo 'rs2', which is
2001	  the documented equivalent, rather than 'rs1'.
2002
2003	The problems are subtler in recent releases.
2004
2005	a) This release provides users with the ability to define their own
2006	   terminal capability extensions, like termcap.  To accomplish this,
2007	   we redesigned the TERMTYPE struct (in term.h).  Very few
2008	   applications use this struct.  They must be recompiled to work with
2009	   the 5.0 library.
2010
2011	a) If you use the extended terminfo names (i.e., you used configure
2012	   --enable-tcap-names), the resulting terminfo database can have some
2013	   entries which are not readable by older versions of ncurses.  This
2014	   is a bug in the older versions:
2015
2016	   + the terminfo database stores booleans, numbers and strings in
2017	     arrays.  The capabilities that are listed in the arrays are
2018	     specified by X/Open.  ncurses recognizes a number of obsolete and
2019	     extended names which are stored past the end of the specified
2020	     entries.
2021
2022	   + a change to read_entry.c in 951001 made the library do an lseek()
2023	     call incorrectly skipping data which is already read from the
2024	     string array.  This happens when the number of strings in the
2025	     terminfo data file is greater than STRCOUNT, the number of
2026	     specified and obsolete or extended strings.
2027
2028	   + as part of alignment with the X/Open final specification, in the
2029	     990109 patch we added two new terminfo capabilities:
2030	     set_a_attributes and set_pglen_inch).  This makes the indices for
2031	     the obsolete and extended capabilities shift up by 2.
2032
2033	   + the last two capabilities in the obsolete/extended list are memu
2034	     and meml, which are found in most terminfo descriptions for xterm.
2035
2036	     When trying to read this terminfo entry, the spurious lseek()
2037	     causes the library to attempt to read the final portion of the
2038	     terminfo data (the text of the string capabilities) 4 characters
2039	     past its starting point, and reads 4 characters too few.  The
2040	     library rejects the data, and applications are unable to
2041	     initialize that terminal type.
2042
2043	   FIX: remove memu and meml from the xterm description.  They are
2044	   obsolete, not used by ncurses.  (It appears that the feature was
2045	   added to xterm to make it more like hpterm).
2046
2047	   This is not a problem if you do not use the -x option of tic to
2048	   create a terminfo database with extended names.  Note that the
2049	   user-defined terminal capabilities are not affected by this bug,
2050	   since they are stored in a table after the older terminfo data ends,
2051	   and are invisible to the older libraries.
2052
2053	c) Some developers did not wish to use the C++ binding, and used the
2054	   configure --without-cxx option.  This causes problems if someone
2055	   uses the ncurses library from C++ because that configure test
2056	   determines the type for C++'s bool and makes ncurses match it, since
2057	   both C++ and curses are specified to declare bool.  Calling ncurses
2058	   functions with the incorrect type for bool will cause execution
2059	   errors.  In 5.0 we added a configure option "--without-cxx-binding"
2060	   which controls whether the binding itself is built and installed.
2061
2062    4.2 (March 2, 1998)
2063	Interface changes:
2064
2065	+ correct prototype for termattrs() as per XPG4 version 2.
2066
2067	+ add placeholder prototypes for color_set(), erasewchar(),
2068	  term_attrs(), wcolor_set() as per XPG4 version 2.
2069
2070	+ add macros getcur[xy] getbeg[xy] getpar[xy], which are defined in
2071	  SVr4 headers.
2072
2073	New extensions: keyok() and define_key().
2074
2075	Terminfo database changes:
2076
2077	+ corrected definition in curses.h for ACS_LANTERN, which was 'I'
2078	  rather than 'i'.
2079
2080    4.1 (May 15, 1997)
2081
2082	We added these extensions:  use_default_colors().  Also added
2083	configure option --enable-const, to support the use of const where
2084	X/Open should have, but did not, specify.
2085
2086	The terminfo database content changed the representation of color for
2087	most entries that use ANSI colors.  SVr4 curses treats the setaf/setab
2088	and setf/setb capabilities differently, interchanging the red/blue
2089	colors in the latter.
2090
2091    4.0 (December 24, 1996)
2092
2093	We bumped to version 4.0 because the newly released Linux dynamic
2094	loader (ld.so.1.8.5) did not load shared libraries whose ABI and REL
2095	versions were inconsistent.  At that point, ncurses ABI was 3.4 and the
2096	REL was 1.9.9g, so we made them consistent.
2097
2098    1.9.9g (December 1, 1996)
2099
2100	This fixed most of the problems with 1.9.9e, and made these interface
2101	changes:
2102
2103	+ remove tparam(), which had been provided for compatibility with
2104	  some termcap.  tparm() is standard, and does not conflict with
2105	  application's fallback for missing tparam().
2106
2107	+ turn off hardware echo in initscr().  This changes the sense of the
2108	  echo() function, which was initialized to echoing rather than
2109	  nonechoing (the latter is specified).  There were several other
2110	  corrections to the terminal I/O settings which cause applications to
2111	  behave differently.
2112
2113	+ implemented several functions (such as attr_on()) which were
2114	  available only as macros.
2115
2116	+ corrected several typos in curses.h.in (i.e., the mvXXXX macros).
2117
2118	+ corrected prototypes for delay_output(),
2119	  has_color, immedok() and idcok().
2120
2121	+ corrected misspelled getbkgd().  Some applications used the
2122	  misspelled name.
2123
2124	+ added _yoffset to WINDOW.  The size of WINDOW does not impact
2125	  applications, since they use only pointers to WINDOW structs.
2126
2127	These changes were made to the terminfo database:
2128
2129	+ removed boolean 'getm' which was available as an extended name.
2130
2131	We added these extensions: wresize(), resizeterm(), has_key() and
2132	mcprint().
2133
2134    1.9.9e (March 24, 1996)
2135
2136	not recommended (a last-minute/untested change left the forms and
2137	menus libraries unusable since they do not repaint the screen).
2138	Foreground/background colors are combined incorrectly, working properly
2139	only on a black background.  When this was released, the X/Open
2140	specification was available only in draft form.
2141
2142	Some applications (such as lxdialog) were "fixed" to work with the
2143	incorrect color scheme.
2144
2145
2146FOR SYSTEM INTEGRATORS:
2147----------------------
2148
2149    Configuration and Installation:
2150
2151	On platforms where ncurses is assumed to be installed in /usr/lib,
2152	the configure script uses "/usr" as a default.  These include any
2153	that use the Linux kernel, as well as these special cases:
2154
2155		FreeBSD, NetBSD, OpenBSD, Cygwin, MinGW
2156
2157	For other platforms, the default is "/usr/local".  See the discussion
2158	of the "--disable-overwrite" option.
2159
2160	The location of the terminfo is set indirectly by the "--datadir"
2161	configure option, e.g., /usr/share/terminfo, given a datadir of
2162	/usr/share.  You may want to override this if you are installing
2163	ncurses libraries in nonstandard locations, but wish to share the
2164	terminfo database.
2165
2166	Normally the ncurses library is configured in a pure-terminfo mode;
2167	that is, with the --disable-termcap option.  This makes the ncurses
2168	library smaller and faster.  The ncurses library includes a termcap
2169	emulation that queries the terminfo database, so even applications that
2170	use raw termcap to query terminal characteristics will win (providing
2171	you recompile and relink them!).
2172
2173	If you must configure with termcap fallback enabled, you may also wish
2174	to use the --enable-getcap option.  This speeds up termcap-based
2175	startups, at the expense of not allowing personal termcap entries to
2176	reference the terminfo tree.  See comments in
2177	ncurses/tinfo/read_termcap.c for further details.
2178
2179	Note that if you have $TERMCAP set, ncurses will use that value
2180	to locate termcap data.  In particular, running from xterm will
2181	set $TERMCAP to the contents of the xterm's termcap entry.
2182	If ncurses sees that, it will not examine /etc/termcap.
2183
2184    Keyboard Mapping:
2185
2186	The terminfo file assumes that Shift-Tab generates \E[Z (the ECMA-48
2187	reverse-tabulation sequence) rather than ^I.  Here are the loadkeys -d
2188	mappings that will set this up:
2189
2190		keycode	 15 = Tab	      Tab
2191			alt     keycode  15 = Meta_Tab
2192			shift	keycode  15 = F26
2193		string F26 ="\033[Z"
2194
2195    Naming the Console Terminal
2196
2197	In various systems there has been a practice of designating the system
2198	console driver type as `console'.  Please do not do this!  It
2199	complicates peoples' lives, because it can mean that several different
2200	terminfo entries from different operating systems all logically want to
2201	be called `console'.
2202
2203	Please pick a name unique to your console driver and set that up
2204	in the /etc/inittab table or local equivalent.  Send the entry to the
2205	terminfo maintainer (listed in the misc/terminfo file) to be included
2206	in the terminfo file, if it is not already there.  See the
2207	term(7) manual page included with this distribution for more on
2208	conventions for choosing type names.
2209
2210	Here are some recommended primary console names:
2211
2212		linux	-- Linux console driver
2213		freebsd	-- FreeBSD
2214		netbsd	-- NetBSD
2215		bsdos	-- BSD/OS
2216
2217	If you are responsible for integrating ncurses for one of these
2218	distributions, please either use the recommended name or get back
2219	to us explaining why you don't want to, so we can work out nomenclature
2220	that will make users' lives easier rather than harder.
2221
2222
2223MODERN XTERM VERSIONS:
2224---------------------
2225
2226	The terminfo database file included with this distribution assumes you
2227	are running a modern xterm based on XFree86 (i.e., xterm-new).  The
2228	earlier X11R6 entry (xterm-r6) and X11R5 entry (xterm-r5) is provided
2229	as well.  See the --without-xterm-new configure script option if you
2230	are unable to update your system.
2231
2232
2233CONFIGURING FALLBACK ENTRIES:
2234----------------------------
2235
2236	In order to support operation of ncurses programs before the terminfo
2237	tree is accessible (that is, in single-user mode or at OS installation
2238	time) the ncurses library can be compiled to include an array of
2239	pre-fetched fallback entries.
2240
2241	NOTE: This must be done on a machine which has ncurses' infocmp and
2242	terminfo database installed (as well as ncurses' tic and infocmp
2243	programs).  That is because the fallback sources are generated and
2244	compiled into the library before the build-tree's copy of infocmp is
2245	available.
2246
2247	These entries are checked by setupterm() only when the conventional
2248	fetches from the terminfo tree and the termcap fallback (if configured)
2249	have been tried and failed.  Thus, the presence of a fallback will not
2250	shadow modifications to the on-disk entry for the same type, when that
2251	entry is accessible.
2252
2253	By default, there are no entries on the fallback list.  After you have
2254	built the ncurses suite for the first time, you can change the list
2255	(the process needs infocmp(1)).  To do so, use the script
2256	ncurses/tinfo/MKfallback.sh.  The configure script option
2257	--with-fallbacks does this (it accepts a comma-separated list of the
2258	names you wish, and does not require a rebuild).
2259
2260	If you wanted (say) to have linux, vt100, and xterm fallbacks, you
2261	might use the commands
2262
2263		cd ncurses;
2264		tinfo/MKfallback.sh \
2265			$TERMINFO \
2266			../misc/terminfo.src \
2267			`which tic` \
2268			`which infocmp` \
2269			linux vt100 xterm >fallback.c
2270
2271	The first four parameters of the script are normally supplied by
2272	the configured makefiles via the "--with-fallbacks" option.  They
2273	are
2274
2275		1) the location of the terminfo database
2276		2) the source for the terminfo entries
2277		3) the location of the tic program, used to create a terminfo
2278		   database.
2279		4) the location of the infocmp program, used to print a terminfo
2280		   description.
2281
2282	Then just rebuild and reinstall the library as you would normally.
2283	You can restore the default empty fallback list with
2284
2285		tinfo/MKfallback.sh \
2286			$TERMINFO \
2287			../misc/terminfo.src \
2288			`which tic` \
2289			`which infocmp` \
2290			>fallback.c
2291
2292	The overhead for an empty fallback list is one trivial stub function.
2293	Any non-empty fallback list is const'd and therefore lives in shareable
2294	text space.  You can look at the comment trailing each initializer in
2295	the generated ncurses/fallback.c file to see the core cost of the
2296	fallbacks.  A good rule of thumb for modern vt100-like entries is that
2297	each one will cost about 2.5K of text space.
2298
2299
2300BSD CONVERSION NOTES:
2301--------------------
2302
2303	If you need to support really ancient BSD programs, you probably
2304	want to configure with the --enable-bsdpad option.  What this does
2305	is enable code in tputs() that recognizes a numeric prefix on a
2306	capability as a request for that much trailing padding in milliseconds.
2307	There are old BSD programs that do things like tputs("50").
2308
2309	(If you are distributing ncurses as a support-library component of
2310	an application you probably want to put the remainder of this section
2311	in the package README file.)
2312
2313	The following note applies only if you have configured ncurses with
2314	--enable-termcap.
2315
2316------------------------------- CUT HERE --------------------------------
2317
2318If you are installing this application privately (either because you
2319have no root access or want to experiment with it before doing a root
2320installation), there are a couple of details you need to be aware of.
2321They have to do with the ncurses library, which uses terminfo rather
2322than termcap for describing terminal characteristics.
2323
2324Though the ncurses library is terminfo-based, it can interpret your
2325TERMCAP variable (if present), any local termcap files you reference
2326through it, and the system termcap file.  However, to avoid slowing
2327down your application startup, it does this only once per terminal type!
2328
2329The first time you load a given terminal type from your termcap
2330database, the library initialization code will automatically write it
2331in terminfo format to a subdirectory under $HOME/.terminfo.  After
2332that, the initialization code will find it there and do a (much
2333faster) terminfo fetch.
2334
2335Usually, all this means is that your home directory will silently grow
2336an invisible .terminfo subdirectory which will get filled in with
2337terminfo descriptions of terminal types as you invoke them.  If anyone
2338ever installs a global terminfo tree on your system, this will quietly
2339stop happening and your $HOME/.terminfo will become redundant.
2340
2341The objective of all this logic is to make converting from BSD termcap
2342as painless as possible without slowing down your application (termcap
2343compilation is expensive).
2344
2345If you don't have a TERMCAP variable or custom personal termcap file,
2346you can skip the rest of this dissertation.
2347
2348If you *do* have a TERMCAP variable and/or a custom personal termcap file
2349that defines a terminal type, that definition will stop being visible
2350to this application after the first time you run it, because it will
2351instead see the terminfo entry that it wrote to $HOME/terminfo the
2352first time around.
2353
2354Subsequently, editing the TERMCAP variable or personal TERMCAP file
2355will have no effect unless you explicitly remove the terminfo entry
2356under $HOME/terminfo.  If you do that, the entry will be recompiled
2357from your termcap resources the next time it is invoked.
2358
2359To avoid these complications, use infocmp(1) and tic(1) to edit the
2360terminfo directory directly.
2361
2362------------------------------- CUT HERE --------------------------------
2363
2364USING GPM:
2365---------
2366	Ncurses 4.1 and up can be configured to use GPM (General Purpose Mouse)
2367	which is used with Linux console.  Be aware that GPM is commonly
2368	installed as a shared library which contains a wrapper for the curses
2369	wgetch() function (libcurses.o).  Some integrators have simplified
2370	linking applications by combining all or part of libcurses.so into the
2371	libgpm.so file, producing symbol conflicts with ncurses (specifically
2372	the wgetch function).  This was originally the BSD curses, but
2373	generally whatever curses library exists on the system.
2374
2375	You may be able to work around this problem by linking as follows:
2376
2377		cc -o foo foo.o -lncurses -lgpm -lncurses
2378
2379	but the linker may not cooperate, producing mysterious errors.
2380	See the FAQ, as well as the discussion under the --with-gpm option:
2381
2382	https://invisible-island.net/ncurses/ncurses.faq.html#using_gpm_lib
2383
2384
2385BUILDING WITH A CROSS-COMPILER:
2386------------------------------
2387	Ncurses can be built with a cross-compiler.  Some parts must be built
2388	with the host's compiler since they are used for building programs
2389	(e.g., ncurses/make_hash and ncurses/make_keys) that generate tables
2390	that are compiled into the ncurses library.  The essential thing to do
2391	is set the BUILD_CC environment variable to your host's compiler, and
2392	run the configure script configuring for the cross-compiler.
2393
2394	The configure options --with-build-cc, etc., are provided to make this
2395	simpler.  Since make_hash and make_keys use only ANSI C features, it
2396	is normally not necessary to provide the other options such as
2397	--with-build-libs, but they are provided for completeness.
2398
2399	Note that all of the generated source-files which are part of ncurses
2400	will be made if you use
2401
2402		make sources
2403
2404	This would be useful in porting to an environment which has little
2405	support for the tools used to generate the sources, e.g., sed, awk and
2406	Bourne-shell.
2407
2408	When ncurses has been successfully cross-compiled, you may want to use
2409	"make install" (with a suitable target directory) to construct an
2410	install tree.  Note that in this case (as with the --with-fallbacks
2411	option), ncurses uses the development platform's tic to do the "make
2412	install.data" portion.
2413
2414	The system's tic program is used to install the terminal database,
2415	even for cross-compiles.  For best results, the tic program should be
2416	from the most current version of ncurses.
2417
2418	NOTE:  the system's tic program may use a different terminfo database
2419	format than the target system.  For instance, as described in term(5),
2420	the conventional terminfo layout uses a directory hierarchy with one
2421	letter names, while some platforms use two-letter names to work with
2422	case-insensitive filesystems.  The configure script searches for a tic
2423	program using the AC_CHECK_TOOL macro, which will prefer programs
2424	using the canonical host prefix in their name.  You can use this fact
2425	to provide a cross-compiler support utility tic, otherwise you can
2426	override the configure script's choice using --with-tic-path
2427
2428
2429BUG REPORTS:
2430-----------
2431	Send any feedback to the ncurses mailing list at
2432	bug-ncurses@gnu.org. To subscribe send mail to
2433	bug-ncurses-request@gnu.org with body that reads:
2434	subscribe ncurses <your-email-address-here>
2435
2436	The Hacker's Guide in the doc directory includes some guidelines
2437	on how to report bugs in ways that will get them fixed most quickly.
2438
2439-- vile:txtmode
2440