Apache HTTP Server

  What is it?
  -----------

  The Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant
  web server.  Originally designed as a replacement for the NCSA HTTP
  Server, it has grown to be the most popular web server on the
  Internet.  As a project of the Apache Software Foundation, the
  developers aim to collaboratively develop and maintain a robust,
  commercial-grade, standards-based server with freely available
  source code.

  The Latest Version
  ------------------

  Details of the latest version can be found on the Apache HTTP
  server project page under http://httpd.apache.org/.

  Documentation
  -------------

  The documentation available as of the date of this release is
  included in HTML format in the docs/manual/ directory.  The most
  up-to-date documentation can be found at
  http://httpd.apache.org/docs/2.4/.

  Installation
  ------------

  Please see the file called INSTALL.  Platform specific notes can be
  found in README.platforms.

  Licensing
  ---------

  Please see the file called LICENSE.

  Cryptographic Software Notice
  -----------------------------

  This distribution may include software that has been designed for use
  with cryptographic software.  The country in which you currently reside
  may have restrictions on the import, possession, use, and/or re-export
  to another country, of encryption software.  BEFORE using any encryption
  software, please check your country's laws, regulations and policies
  concerning the import, possession, or use, and re-export of encryption
  software, to see if this is permitted.  See <http://www.wassenaar.org/>
  for more information.

  The U.S. Government Department of Commerce, Bureau of Industry and
  Security (BIS), has classified this software as Export Commodity
  Control Number (ECCN) 5D002.C.1, which includes information security
  software using or performing cryptographic functions with asymmetric
  algorithms.  The form and manner of this Apache Software Foundation
  distribution makes it eligible for export under the License Exception
  ENC Technology Software Unrestricted (TSU) exception (see the BIS
  Export Administration Regulations, Section 740.13) for both object
  code and source code.

  The following provides more details on the included files that
  may be subject to export controls on cryptographic software:

    Apache httpd 2.0 and later versions include the mod_ssl module under
       modules/ssl/
    for configuring and listening to connections over SSL encrypted
    network sockets by performing calls to a general-purpose encryption
    library, such as OpenSSL or the operating system's platform-specific
    SSL facilities.

    In addition, some versions of apr-util provide an abstract interface
    for symmetrical cryptographic functions that make use of a
    general-purpose encryption library, such as OpenSSL, NSS, or the
    operating system's platform-specific facilities. This interface is
    known as the apr_crypto interface, with implementation beneath the
    /crypto directory. The apr_crypto interface is used by the
    mod_session_crypto module available under
      modules/session
    for optional encryption of session information.

    Some object code distributions of Apache httpd, indicated with the
    word "crypto" in the package name, may include object code for the
    OpenSSL encryption library as distributed in open source form from
    <http://www.openssl.org/source/>.

  The above files are optional and may be removed if the cryptographic
  functionality is not desired or needs to be excluded from redistribution.
  Distribution packages of Apache httpd that include the word "nossl"
  in the package name have been created without the above files and are
  therefore not subject to this notice.

  Contacts
  --------

     o If you want to be informed about new code releases, bug fixes,
       security fixes, general news and information about the Apache server
       subscribe to the apache-announce mailing list as described under
       <http://httpd.apache.org/lists.html#http-announce>

     o If you want freely available support for running Apache please join the
       Apache user community by subscribing to Users Mailing List at
       <http://httpd.apache.org/userslist.html> or one of the following
       USENET newsgroups:
         comp.infosystems.www.servers.unix
         comp.infosystems.www.servers.ms-windows
       Also available at:
         <http://groups.google.com/groups?group=comp.infosystems.www.servers>

     o If you want commercial support for running Apache please contact
       one of the companies and contractors which are listed at
       <http://www.apache.org/info/support.cgi>

     o If you have a concrete bug report for Apache please go to the
       Apache Group Bug Database and submit your report:
       <http://httpd.apache.org/bug_report.html>

     o If you want to participate in actively developing Apache please
       subscribe to the `dev@httpd.apache.org' mailing list as described at
       <http://httpd.apache.org/lists.html#http-dev>

                          Apache HTTP Server

  Platform specific notes:
  ------------------------

================
  Darwin (OS X):
   Apache 2 relies heavily on the use of autoconf and libtool to
   provide a build environment.  Darwin provides these tools as part
   of the Developers Tools package. Under Darwin, however, GNUlibtool
   is installed as 'glibtool' to avoid conflicting with the Darwin
   'libtool' program.  Apache 2 knows about this so that's not a
   problem.

   As of OS X 10.2 (Jaguar), the bundled versions work perfectly. Partly
   this is due to the fact that /bin/sh is now 'bash' and not 'zsh' as
   well as the fact that the bundled versions are up-to-date:
   autoconf 2.52 and (g)libtool 1.4.2.

   Earlier versions of OS X are not so fortunate, and the bundled tools
   are not only older versions, but also, for the most part, do not work
   well.  If you are interested in developing under Darwin, we
   recommend that you obtain and install replacement versions of what
   are normally installed on Darwin (and OS X, as of v10.1.5).  If
   you build your own versions of autoconf 2.52 and libtool 1.4.2, be
   aware that there are some Darwin specific patches to the official
   code that still must be applied for them to fully work.  A useful
   page to check out is:

      http://fink.sourceforge.net/doc/porting/libtool.php

   Pier Fumagalli also provides pre-built Darwin packages of the
   patched autoconf and libtool suites, available at:

      http://www.apache.org/~pier/macosx/

   You will note that GNU libtool should actually be installed as
   glibtool, to avoid conflict with a Darwin program of the same
   name.  Pier's packages have this change already.  All files are
   installed under /usr/local/ so to use these versions, and be sure
   that /usr/local/bin is earlier in your PATH.

   There have been some reports that autoconf 2.52 prevents Apache's
   build system from correctly handling passing multi-value envvars
   to the build system (eg: CFLAGS="-g -O3" ./configure),  causing
   errors.  Use of bash does not seem to help in this situation.  If
   this affects you, downgrading to autoconf 2.13 (which is installed
   on Darwin) will help.

   With Leopard (at least up to 10.5.2), when running configure
   you will likely see errors such as:

      rm: conftest.dSYM: is a directory

   This is a known issue and will be fixed in a later version of the
   autoconf suite. These errors can be safely ignored.

   With Darwin 10, the default C compiler (gcc) will try to build
   multi-architecture bundles. This causes problems with APR, which
   needs to know various data-type sizes which it assumes are universal
   for platforms. Until this is fully fixed, we recommend using the
   '-arch i386' gcc option when building both Apache and APR.

==========
  FreeBSD:
   autoconf 2.52 creates scripts that are incompatible with the Posix
   shell implementation (/bin/sh) on FreeBSD.  Be sure to use v2.13
   of autoconf.

   Threaded MPMs are not supported on FreeBSD 4.x.  Current releases of
   FreeBSD 5.x (5.2 or later) support threaded MPMs correctly.  You must pass
   '--enable-threads=yes' to APR's configure in order to enable threads.
   Additionally, you must use libthr or libkse via libmap.conf as the default
   libc_r is still broken as of this writing.  Please consult the man page for
   libmap.conf for more details about configuring libthr or libkse.
================
  HP-UX:
   The dlopen() system call in HP-UX has problems when loading/unloading
   C++ modules. The problem can be resolved by using shl_load() instead
   of dlopen(). This is fixed in the Apache 2.0.44 release.
   To enable loading of C++ modules, the httpd binary has to be linked with
   the following libraries :

   HP-UX (11.0 / 11i):
      When using shl_load        : "cpprt0_stub.s -lcl"
      When using dlopen          : "cpprt0_stub.s -lcl -lCsup"

   HP-UX (11i version 1.5 and greater):
      When using dlopen/shl_load : "cpprt0_stub.s -lcl -lunwind"

   The cpprt0_stub.s can be downloaded from the web site :
      http://h21007.www2.hp.com/hpux-devtools/CXX/hpux-devtools.0107/0083.html

   Compile cpprt0_stub.s with the PIC option
     cc -c +z cpprt0_stub.s
       - OR -
     gcc -c -fPIC cpprt0_stub.s
================
  AIX, using the vendor C compiler with optimization:
    There is an issue with compiling server/core.c with optimization enabled
    which has been seen with C for AIX 5.0.2.3 and above.  (5.0.2.0, 5.0.2.1,
    and 5.0.2.2 have an additional problem with Apache 2.0.x, so either upgrade
    the compiler or don't use optimization in order to avoid it.)

    cc_r works fine with -O2 but xlc_r does not.  In order to use xlc_r with
    -O2, apply the patch at

    http://www.apache.org/dist/httpd/patches/apply_to_2.0.49/aix_xlc_optimization.patch

    (That patch works with many recent levels of Apache 2+.)

================
  Solaris:

    On Solaris, better performance may be achieved by using the Sun Studio
    compiler instead of gcc.  As of version 11, it is now free (registration
    required).  Download the compiler from:

    http://developers.sun.com/prodtech/cc/downloads/index.jsp

    If you use Sun Studio, the following compiler flags (CFLAGS) are
    recommended:

      -XO4 -xchip=generic

================
  Ubuntu:

    You will need to ensure that you have either libtool 1.5.6
    or 2.2.6b, or later. Expat 2.0.1 and PCRE 8.02 are also
    recommended to be installed. If building PCRE from source,
    you'll also need g++.