1dnl A function to check if the system's zlib library should be used.  The
2dnl builtin zlib dnl is used by default unless the user configured with
3dnl --with-system-zlib.
4
5AC_DEFUN([AM_ZLIB],
6[
7  # Use the system's zlib library.
8  zlibdir="-L\$(top_builddir)/../zlib"
9  zlibinc="-I\$(top_srcdir)/../zlib"
10  AC_ARG_WITH(system-zlib,
11  [AS_HELP_STRING([--with-system-zlib], [use installed libz])],
12  if test x$with_system_zlib = xyes ; then
13    zlibdir=
14    zlibinc=
15  fi
16  )
17  AC_SUBST(zlibdir)
18  AC_SUBST(zlibinc)
19])
20