paulo@0: ###############################################################################
paulo@0: ## $Id: zlib.m4,v 1.1 2003/09/17 22:26:07 hipnod Exp $
paulo@0: ###############################################################################
paulo@0: 
paulo@0: dnl
paulo@0: dnl Check for zlib in some bizarre locations...
paulo@0: dnl
paulo@0: AC_DEFUN([GIFT_PLUGIN_CHECK_ZLIB], 
paulo@0: [
paulo@0:    # set the minimum ZLIB_VER we're willing to link against...
paulo@0:    ZLIB_VER=1.1.4
paulo@0: 
paulo@0:    # for some reason Darwin has a 1.1.3 version with the 1.1.4 security fix
paulo@0:    # applied backwards...
paulo@0:    case "${host}" in
paulo@0:    *-*-darwin* )
paulo@0:      ZLIB_VER=1.1.3
paulo@0:    ;;
paulo@0:    esac
paulo@0: 
paulo@0:    if test x"$OPT_ZLIB" = xno; then
paulo@0:       zlib_ok=no
paulo@0:    else
paulo@0:       ZLIB_DIRS="$OPT_ZLIB /usr /usr/local /sw"
paulo@0:       for ZLIB_DIR in $ZLIB_DIRS;
paulo@0:       do
paulo@0:          LIBS_SAVE="$LIBS"
paulo@0:          CPPFLAGS_SAVE="$CPPFLAGS"
paulo@0:          LIBS="$LIBS -L${ZLIB_DIR}/lib"
paulo@0:          CPPFLAGS="$CPPFLAGS -I${ZLIB_DIR}/include"
paulo@0:          AC_CACHE_CHECK(
paulo@0:             [for zlib version ${ZLIB_VER}+ in ${ZLIB_DIR}],
paulo@0:             zlib_ok,
paulo@0:             AC_TRY_RUN(
paulo@0:               [#include <zlib.h>
paulo@0:                #include <string.h>
paulo@0:                void main() {
paulo@0:                  exit(strcmp(ZLIB_VERSION, "${ZLIB_VER}") < 0);
paulo@0:                }
paulo@0:                ],
paulo@0:               [zlib_ok=yes],
paulo@0:               [zlib_ok=no],
paulo@0:               [zlib_ok=yes]))
paulo@0: 
paulo@0:          if test "$zlib_ok" != "no"; then
paulo@0:             AC_CHECK_FUNC(gzread, , AC_CHECK_LIB(z, gzread))
paulo@0:             AC_DEFINE(USE_ZLIB)
paulo@0:             AC_SUBST(USE_ZLIB)
paulo@0:             break
paulo@0:          fi
paulo@0:          LIBS="$LIBS_SAVE"
paulo@0:          CPPFLAGS="$CPPFLAGS_SAVE"
paulo@0:       done
paulo@0: 
paulo@0:       if test "$zlib_ok" = "no"; then
paulo@0:          AC_MSG_ERROR([
paulo@0: NOTE: The zlib compression library version ${ZLIB_VER} or greater was not found
paulo@0:       on your system.
paulo@0: 
paulo@0:       If zlib ${ZLIB_VER}+ is not installed, install it.
paulo@0:          ])
paulo@0:       fi
paulo@0:    fi
paulo@0: ])