mkvtoolnix/ac/zlib.m4

dnl
dnl Check for zlib
dnl

PKG_CHECK_EXISTS([zlib],[zlib_found=yes],[zlib_found=no])
if test x"$zlib_found" = xyes; then
  PKG_CHECK_MODULES([ZLIB],[zlib],[zlib_found=yes])
else
  AC_MSG_CHECKING(for ZLIB)
  save_LIBS="$LIBS"
  LIBS="$LIBS -lz"
  AC_TRY_LINK(
    [#include <zlib.h>],
    [inflate(0, 0);],
    [zlib_found=yes; ZLIB_LIBS=-lz])
  LIBS="$save_LIBS"
  AC_MSG_RESULT($zlib_found)
fi

if test x"$zlib_found" != xyes; then
  AC_MSG_ERROR([Could not find the zlib library])
fi
Split configure.in in several smaller files. 2008-08-27 20:38:55 +00:00			`dnl`
			`dnl Check for zlib`
			`dnl`

configure: try to detect zlib simply via -lz if no pkg-config module installed for it This can happen e.g. on Mac OS. 2015-04-29 19:50:47 +00:00			`PKG_CHECK_EXISTS([zlib],[zlib_found=yes],[zlib_found=no])`
			`if test x"$zlib_found" = xyes; then`
			`PKG_CHECK_MODULES([ZLIB],[zlib],[zlib_found=yes])`
			`else`
			`AC_MSG_CHECKING(for ZLIB)`
			`save_LIBS="$LIBS"`
			`LIBS="$LIBS -lz"`
			`AC_TRY_LINK(`
			`[#include <zlib.h>],`
			`[inflate(0, 0);],`
			`[zlib_found=yes; ZLIB_LIBS=-lz])`
			`LIBS="$save_LIBS"`
			`AC_MSG_RESULT($zlib_found)`
			`fi`
Build system: use pkg-config's own macros for library detection where possible 2011-10-22 22:07:36 +00:00
			`if test x"$zlib_found" != xyes; then`
			`AC_MSG_ERROR([Could not find the zlib library])`
			`fi`