]> git.saurik.com Git - wxWidgets.git/blobdiff - configure.in
Small doc changes and added missing files.lst to contrib.rsp
[wxWidgets.git] / configure.in
index b39203473ba0f0ed9d2c17a09a7f897f64bd0dfe..5f22b27176a44fc2d0e52f1667c5c7f8a6e37975 100644 (file)
@@ -11,323 +11,6 @@ dnl
 dnl Version: $Id$
 dnl ---------------------------------------------------------------------------
 
-dnl ===========================================================================
-dnl macros to find the a file in the list of include/lib paths
-dnl ===========================================================================
-
-dnl ---------------------------------------------------------------------------
-dnl call WX_PATH_FIND_INCLUDES(search path, header name), sets ac_find_includes
-dnl to the full name of the file that was found or leaves it empty if not found
-dnl ---------------------------------------------------------------------------
-AC_DEFUN([WX_PATH_FIND_INCLUDES],
-[
-ac_find_includes=
-for ac_dir in $1;
-  do
-    if test -f "$ac_dir/$2"; then
-      ac_find_includes=$ac_dir
-      break
-    fi
-  done
-])
-
-dnl ---------------------------------------------------------------------------
-dnl call WX_PATH_FIND_LIBRARIES(search path, header name), sets ac_find_libraries
-dnl to the full name of the file that was found or leaves it empty if not found
-dnl ---------------------------------------------------------------------------
-AC_DEFUN([WX_PATH_FIND_LIBRARIES],
-[
-ac_find_libraries=
-for ac_dir in $1;
-  do
-    for ac_extension in a so sl dylib; do
-      if test -f "$ac_dir/lib$2.$ac_extension"; then
-        ac_find_libraries=$ac_dir
-        break 2
-      fi
-    done
-  done
-])
-
-dnl ---------------------------------------------------------------------------
-dnl Path to include, already defined
-dnl ---------------------------------------------------------------------------
-AC_DEFUN([WX_INCLUDE_PATH_EXIST],
-[
-  ac_path_to_include=$1
-  echo "$2" | grep "\-I$1" > /dev/null
-  result=$?
-  if test $result = 0; then
-    ac_path_to_include=""
-  else
-    ac_path_to_include=" -I$1"
-  fi
-])
-
-dnl ---------------------------------------------------------------------------
-dnl Path to link, already defined
-dnl ---------------------------------------------------------------------------
-AC_DEFUN([WX_LINK_PATH_EXIST],
-[
-  echo "$2" | grep "\-L$1" > /dev/null
-  result=$?
-  if test $result = 0; then
-    ac_path_to_link=""
-  else
-    ac_path_to_link=" -L$1"
-  fi
-])
-
-dnl ===========================================================================
-dnl C++ features test
-dnl ===========================================================================
-
-dnl ---------------------------------------------------------------------------
-dnl WX_CPP_NEW_HEADERS checks whether the compiler has "new" <iostream> header
-dnl or only the old <iostream.h> one - it may be generally assumed that if
-dnl <iostream> exists, the other "new" headers (without .h) exist too.
-dnl
-dnl call WX_CPP_NEW_HEADERS(actiof-if-true, action-if-false-or-cross-compiling)
-dnl ---------------------------------------------------------------------------
-
-AC_DEFUN([WX_CPP_NEW_HEADERS],
-[
-  if test "$cross_compiling" = "yes"; then
-    ifelse([$2], , :, [$2])
-  else
-    AC_LANG_SAVE
-    AC_LANG_CPLUSPLUS
-
-    AC_CHECK_HEADERS(iostream)
-
-    if test "$ac_cv_header_iostream" = "yes" ; then
-      ifelse([$1], , :, [$1])
-    else
-      ifelse([$2], , :, [$2])
-    fi
-
-    AC_LANG_RESTORE
-  fi
-])
-
-dnl ---------------------------------------------------------------------------
-dnl WX_CPP_BOOL checks whether the C++ compiler has a built in bool type
-dnl
-dnl call WX_CPP_BOOL - will define HAVE_BOOL if the compiler supports bool
-dnl ---------------------------------------------------------------------------
-
-AC_DEFUN([WX_CPP_BOOL],
-[
-  AC_CACHE_CHECK([if C++ compiler supports bool], wx_cv_cpp_bool,
-  [
-    AC_LANG_SAVE
-    AC_LANG_CPLUSPLUS
-
-    AC_TRY_COMPILE(
-      [
-      ],
-      [
-        bool b = true;
-
-        return 0;
-      ],
-      [
-        wx_cv_cpp_bool=yes
-      ],
-      [
-        wx_cv_cpp_bool=no
-      ]
-    )
-
-    AC_LANG_RESTORE
-  ])
-
-  if test "$wx_cv_cpp_bool" = "yes"; then
-    AC_DEFINE(HAVE_BOOL)
-  fi
-])
-
-dnl ---------------------------------------------------------------------------
-dnl a slightly better AC_C_BIGENDIAN macro which allows cross-compiling
-dnl ---------------------------------------------------------------------------
-
-AC_DEFUN([WX_C_BIGENDIAN],
-[AC_CACHE_CHECK([whether byte ordering is bigendian], ac_cv_c_bigendian,
-[ac_cv_c_bigendian=unknown
-# See if sys/param.h defines the BYTE_ORDER macro.
-AC_TRY_COMPILE([#include <sys/types.h>
-#include <sys/param.h>], [
-#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
- bogus endian macros
-#endif], [# It does; now see whether it defined to BIG_ENDIAN or not.
-AC_TRY_COMPILE([#include <sys/types.h>
-#include <sys/param.h>], [
-#if BYTE_ORDER != BIG_ENDIAN
- not big endian
-#endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])
-if test $ac_cv_c_bigendian = unknown; then
-AC_TRY_RUN([main () {
-  /* Are we little or big endian?  From Harbison&Steele.  */
-  union
-  {
-    long l;
-    char c[sizeof (long)];
-  } u;
-  u.l = 1;
-  exit (u.c[sizeof (long) - 1] == 1);
-}], [ac_cv_c_bigendian=no], [ac_cv_c_bigendian=yes], [ac_cv_c_bigendian=unknown])
-fi])
-if test $ac_cv_c_bigendian = unknown; then
-  AC_MSG_WARN([Assuming little-endian target machine - this may be overriden by adding the line "ac_cv_c_bigendian=${ac_cv_c_bigendian='yes'}" to config.cache file])
-fi
-if test $ac_cv_c_bigendian = yes; then
-  AC_DEFINE(WORDS_BIGENDIAN)
-fi
-])
-
-dnl ---------------------------------------------------------------------------
-dnl override AC_ARG_ENABLE/WITH to cache the results in .cache file
-dnl ---------------------------------------------------------------------------
-
-AC_DEFUN([WX_ARG_CACHE_INIT],
-        [
-          wx_arg_cache_file="configarg.cache"
-          echo "loading argument cache $wx_arg_cache_file"
-          rm -f ${wx_arg_cache_file}.tmp
-          touch ${wx_arg_cache_file}.tmp
-          touch ${wx_arg_cache_file}
-        ])
-
-AC_DEFUN([WX_ARG_CACHE_FLUSH],
-        [
-          echo "saving argument cache $wx_arg_cache_file"
-          mv ${wx_arg_cache_file}.tmp ${wx_arg_cache_file}
-        ])
-
-dnl this macro checks for a three-valued command line --with argument:
-dnl   possible arguments are 'yes', 'no', 'sys', or 'builtin'
-dnl usage: WX_ARG_SYS_WITH(option, helpmessage, variable-name)
-AC_DEFUN([WX_ARG_SYS_WITH],
-        [
-          AC_MSG_CHECKING([for --with-$1])
-          no_cache=0
-          AC_ARG_WITH($1, [$2],
-                      [
-                        if test "$withval" = yes; then
-                          ac_cv_use_$1='$3=yes'
-                        elif test "$withval" = no; then
-                          ac_cv_use_$1='$3=no'
-                        elif test "$withval" = sys; then
-                          ac_cv_use_$1='$3=sys'
-                        elif test "$withval" = builtin; then
-                          ac_cv_use_$1='$3=builtin'
-                        else
-                          AC_MSG_ERROR([Invalid value for --with-$1: should be yes, no, sys, or builtin])
-                        fi
-                      ],
-                      [
-                        LINE=`grep "$3" ${wx_arg_cache_file}`
-                        if test "x$LINE" != x ; then
-                          eval "DEFAULT_$LINE"
-                        else
-                          no_cache=1
-                        fi
-
-                        ac_cv_use_$1='$3='$DEFAULT_$3
-                      ])
-
-          eval "$ac_cv_use_$1"
-          if test "$no_cache" != 1; then
-            echo $ac_cv_use_$1 >> ${wx_arg_cache_file}.tmp
-          fi
-
-          if test "$$3" = yes; then
-            AC_MSG_RESULT(yes)
-          elif test "$$3" = no; then
-            AC_MSG_RESULT(no)
-          elif test "$$3" = sys; then
-            AC_MSG_RESULT([system version])
-          elif test "$$3" = builtin; then
-            AC_MSG_RESULT([builtin version])
-          else
-            AC_MSG_ERROR([Invalid value for --with-$1: should be yes, no, sys, or builtin])
-          fi
-        ])
-
-dnl this macro checks for a command line argument and caches the result
-dnl usage: WX_ARG_WITH(option, helpmessage, variable-name)
-AC_DEFUN([WX_ARG_WITH],
-        [
-          AC_MSG_CHECKING([for --with-$1])
-          no_cache=0
-          AC_ARG_WITH($1, [$2],
-                      [
-                        if test "$withval" = yes; then
-                          ac_cv_use_$1='$3=yes'
-                        else
-                          ac_cv_use_$1='$3=no'
-                        fi
-                      ],
-                      [
-                        LINE=`grep "$3" ${wx_arg_cache_file}`
-                        if test "x$LINE" != x ; then
-                          eval "DEFAULT_$LINE"
-                        else
-                          no_cache=1
-                        fi
-
-                        ac_cv_use_$1='$3='$DEFAULT_$3
-                      ])
-
-          eval "$ac_cv_use_$1"
-          if test "$no_cache" != 1; then
-            echo $ac_cv_use_$1 >> ${wx_arg_cache_file}.tmp
-          fi
-
-          if test "$$3" = yes; then
-            AC_MSG_RESULT(yes)
-          else
-            AC_MSG_RESULT(no)
-          fi
-        ])
-
-dnl like WX_ARG_WITH but uses AC_ARG_ENABLE instead of AC_ARG_WITH
-dnl usage: WX_ARG_ENABLE(option, helpmessage, variable-name)
-AC_DEFUN([WX_ARG_ENABLE],
-        [
-          AC_MSG_CHECKING([for --enable-$1])
-          no_cache=0
-          AC_ARG_ENABLE($1, [$2],
-                        [
-                          if test "$enableval" = yes; then
-                            ac_cv_use_$1='$3=yes'
-                          else
-                            ac_cv_use_$1='$3=no'
-                          fi
-                        ],
-                        [
-                          LINE=`grep "$3" ${wx_arg_cache_file}`
-                          if test "x$LINE" != x ; then
-                            eval "DEFAULT_$LINE"
-                          else
-                            no_cache=1
-                          fi
-
-                          ac_cv_use_$1='$3='$DEFAULT_$3
-                        ])
-
-          eval "$ac_cv_use_$1"
-          if test "$no_cache" != 1; then
-            echo $ac_cv_use_$1 >> ${wx_arg_cache_file}.tmp
-          fi
-
-          if test "$$3" = yes; then
-            AC_MSG_RESULT(yes)
-          else
-            AC_MSG_RESULT(no)
-          fi
-        ])
-
 dnl ---------------------------------------------------------------------------
 dnl initialization
 dnl ---------------------------------------------------------------------------
@@ -984,7 +667,7 @@ else
   DEFAULT_wxUSE_IMAGE=yes
   DEFAULT_wxUSE_GIF=yes
   DEFAULT_wxUSE_PCX=yes
-  DEFAULT_wxUSE_IFF=yes
+  DEFAULT_wxUSE_IFF=no
   DEFAULT_wxUSE_PNM=yes
   DEFAULT_wxUSE_XPM=yes
   DEFAULT_wxUSE_ICO_CUR=yes
@@ -1532,8 +1215,29 @@ dnl strip command
 dnl   defines STRIP as strip or nothing if not found
 AC_CHECK_PROG(STRIP, strip, strip, true)
 
+dnl does make support "-include" (only GNU make does AFAIK)?
+AC_CACHE_CHECK([if make is GNU make], wx_cv_prog_makeisgnu,
+[
+    if ( ${SHELL-sh} -c "${MAKE-make} --version" 2> /dev/null |
+            egrep -s GNU); then
+        wx_cv_prog_makeisgnu="yes"
+    else
+        wx_cv_prog_makeisgnu="no"
+    fi
+])
+
+if test "x$wx_cv_prog_makeisgnu" = "xyes"; then
+    IF_GNU_MAKE=""
+else
+    IF_GNU_MAKE="#"
+fi
+
+AC_SUBST(IF_GNU_MAKE)
+
+dnl we don't need to check for VPATH support in GNU make - it does have it
+if test "x$wx_cv_prog_makeisgnu" != "xyes"; then
 dnl check if VPATH works
-AC_MSG_CHECKING(make for VPATH support)
+AC_CACHE_CHECK([if make supports VPATH], wx_cv_prog_makevpath, [
 dnl create Makefile
 cat - << EOF > confMake
 check : file
@@ -1550,10 +1254,14 @@ RESULT=$?
 rm -f sub/file check final_file confMake
 rmdir sub
 if test "$RESULT" = 0; then
-  AC_MSG_RESULT(yes)
+  wx_cv_prog_makevpath="yes"
 else
-  AC_MSG_RESULT(no)
-  AC_MSG_ERROR([
+  wx_cv_prog_makevpath="no"
+fi
+])
+
+if test "x$wx_cv_prog_makevpath" != "xyes"; then
+AC_MSG_ERROR([
 You need a make-utility that is able to use the variable
 VPATH correctly.
 If your version of make does not support VPATH correctly,
@@ -1564,7 +1272,8 @@ setenv MAKE gmake; ./configure  for csh-type shells
 Also please do remember to use gmake in this case every time
 you are trying to compile.
 ])
-fi
+fi dnl make without VPATH
+fi dnl not GNU make
 
 dnl YACC checks
 dnl   defines YACC with the appropriate command
@@ -1755,32 +1464,41 @@ PNG_INCLUDE=
 PNG_LINK=
 if test "$wxUSE_LIBPNG" != "no" ; then
     AC_DEFINE(wxUSE_LIBPNG)
+    
+    if test "$wxUSE_MGL" = 1 -a "$wxUSE_LIBPNG" = "builtin" ; then
+        AC_MSG_WARN([wxMGL doesn't work with builtin png library, will use MGL one instead])
+        wxUSE_LIBPNG=sys
+    fi
 
     dnl for the check below to have a chance to succeed, we must already have
-    dnl libz somewhere
-    if test "$wxUSE_LIBPNG" = "sys" -a "$wxUSE_ZLIB" != "sys" ; then
+    dnl libz somewhere (don't do this when bulding wxMGL since its libpng
+    dnl doesn't depend on zlib)
+    if test "$wxUSE_MGL" != 1 -a "$wxUSE_LIBPNG" = "sys" -a "$wxUSE_ZLIB" != "sys" ; then
         AC_MSG_WARN([system png library doesn't work without system zlib, will use built-in instead])
         wxUSE_LIBPNG=builtin
     fi
 
-    if test "$wxUSE_LIBPNG" = "sys" -o "$wxUSE_LIBPNG" = "yes" ; then
-        AC_CHECK_HEADER(png.h,
-                        AC_CHECK_LIB(png, png_check_sig,
-                                     PNG_LINK=" -lpng",
-                                     ,
-                                     [-lz -lm])
-                       )
+    if test "$wxUSE_MGL" != 1 ; then
+        dnl Don't check for libpng when building wxMGL, libmgl contains it
+        if test "$wxUSE_LIBPNG" = "sys" -o "$wxUSE_LIBPNG" = "yes" ; then
+            AC_CHECK_HEADER(png.h,
+                            AC_CHECK_LIB(png, png_check_sig,
+                                         PNG_LINK=" -lpng",
+                                         ,
+                                         [-lz -lm])
+                           )
 
-        if test "x$PNG_LINK" = "x" ; then
-            if test "$wxUSE_LIBPNG" = "sys" ; then
-                AC_MSG_ERROR([system png library not found! Use --with-libpng=builtin to use built-in version])
+            if test "x$PNG_LINK" = "x" ; then
+                if test "$wxUSE_LIBPNG" = "sys" ; then
+                    AC_MSG_ERROR([system png library not found! Use --with-libpng=builtin to use built-in version])
+                else
+                    AC_MSG_WARN([system png library not found, will use built-in instead])
+                    wxUSE_LIBPNG=builtin
+                fi
             else
-                AC_MSG_WARN([system png library not found, will use built-in instead])
-                wxUSE_LIBPNG=builtin
+                dnl we are using the system library
+                wxUSE_LIBPNG=yes
             fi
-        else
-            dnl we are using the system library
-            wxUSE_LIBPNG=yes
         fi
     fi
 
@@ -1800,40 +1518,48 @@ JPEG_LINK=
 if test "$wxUSE_LIBJPEG" != "no" ; then
     AC_DEFINE(wxUSE_LIBJPEG)
 
-    if test "$wxUSE_LIBJPEG" = "sys" -o "$wxUSE_LIBJPEG" = "yes" ; then
-        dnl can't use AC_CHECK_HEADER as jconfig.h defines things like
-        dnl HAVE_STDLIB_H which are already defined and this provokes
-        dnl a compiler warning which configure considers as an error...
-        AC_MSG_CHECKING(for jpeglib.h)
-        AC_CACHE_VAL(ac_cv_header_jpeglib_h,
-            AC_TRY_COMPILE(
-                [
-                    #undef HAVE_STDLIB_H
-                    #include <stdio.h>
-                    #include <jpeglib.h>
-                ],
-                [
-                ],
-                ac_cv_header_jpeglib_h=yes,
-                ac_cv_header_jpeglib_h=no
+    if test "$wxUSE_MGL" = 1 -a "$wxUSE_LIBJPEG" = "builtin" ; then
+        AC_MSG_WARN([wxMGL doesn't work with builtin jpeg library, will use MGL one instead])
+        wxUSE_LIBJPEG=sys
+    fi
+
+    if test "$wxUSE_MGL" != 1 ; then
+        dnl Don't check for libjpeg when building wxMGL, libmgl contains it
+        if test "$wxUSE_LIBJPEG" = "sys" -o "$wxUSE_LIBJPEG" = "yes" ; then
+            dnl can't use AC_CHECK_HEADER as jconfig.h defines things like
+            dnl HAVE_STDLIB_H which are already defined and this provokes
+            dnl a compiler warning which configure considers as an error...
+            AC_MSG_CHECKING(for jpeglib.h)
+            AC_CACHE_VAL(ac_cv_header_jpeglib_h,
+                AC_TRY_COMPILE(
+                    [
+                        #undef HAVE_STDLIB_H
+                        #include <stdio.h>
+                        #include <jpeglib.h>
+                    ],
+                    [
+                    ],
+                    ac_cv_header_jpeglib_h=yes,
+                    ac_cv_header_jpeglib_h=no
+                )
             )
-        )
-        AC_MSG_RESULT($ac_cv_header_jpeglib_h)
+            AC_MSG_RESULT($ac_cv_header_jpeglib_h)
 
-        if test "$ac_cv_header_jpeglib_h" = "yes"; then
-            AC_CHECK_LIB(jpeg, jpeg_read_header, JPEG_LINK=" -ljpeg")
-        fi
+            if test "$ac_cv_header_jpeglib_h" = "yes"; then
+                AC_CHECK_LIB(jpeg, jpeg_read_header, JPEG_LINK=" -ljpeg")
+            fi
 
-        if test "x$JPEG_LINK" = "x" ; then
-            if test "$wxUSE_LIBJPEG" = "sys" ; then
-                AC_MSG_ERROR([system jpeg library not found! Use --with-libjpeg=builtin to use built-in version])
+            if test "x$JPEG_LINK" = "x" ; then
+                if test "$wxUSE_LIBJPEG" = "sys" ; then
+                    AC_MSG_ERROR([system jpeg library not found! Use --with-libjpeg=builtin to use built-in version])
+                else
+                    AC_MSG_WARN([system jpeg library not found, will use built-in instead])
+                    wxUSE_LIBJPEG=builtin
+                fi
             else
-                AC_MSG_WARN([system jpeg library not found, will use built-in instead])
-                wxUSE_LIBJPEG=builtin
+                dnl we are using the system library
+                wxUSE_LIBJPEG=sys
             fi
-        else
-            dnl we are using the system library
-            wxUSE_LIBJPEG=sys
         fi
     fi
 
@@ -2321,12 +2047,21 @@ equivalent variable and GTK+ is version 1.2.3 or above.
 
     if test "$wxUSE_UNIVERSAL" = "yes"; then
         ALL_OBJECTS="\$(GUI_LOWLEVEL_OBJS) \${UNIVOBJS}"
+
+        dnl ALL_SOURCES and ALL_HEADERS shouldn't include really all sources
+        dnl and headers as some/most are not needed for wxUniv but I don't
+        dnl have time to add GUI_LOWLEVEL_SOURCES/HEADERS stuff now (TODO!)
+        ALL_SOURCES="\$(ALL_SOURCES) \${UNIV_SOURCES}"
+        ALL_HEADERS="\$(ALL_HEADERS) \${UNIV_HEADERS}"
+
         PORT_FILES="${PORT_FILES} \${top_srcdir}/src/univ/files.lst"
         TOOLKIT_VPATH="\${top_srcdir}/src/univ${PATH_IFS}\${top_srcdir}/src/univ/themes${PATH_IFS}\${top_srcdir}/src/${TOOLKIT_DIR}"
         TOOLCHAIN_DEFS="${TOOLCHAIN_DEFS} -D__WXUNIVERSAL__"
         WIDGET_SET=univ
     else
         ALL_OBJECTS="\$(GUIOBJS)"
+        ALL_SOURCES="\$(ALL_SOURCES)"
+        ALL_HEADERS="\$(ALL_HEADERS)"
     fi
 
     ALL_OBJECTS="${ALL_OBJECTS} \$(COMMONOBJS) \$(GENERICOBJS)"
@@ -2759,8 +2494,6 @@ dnl defined HAVE_WCTYPE_H
 AC_CHECK_HEADERS(wctype.h)
 dnl defines HAVE_FNMATCH_H
 AC_CHECK_HEADERS(fnmatch.h)
-dnl defines HAVE_ICONV_H (Unix98 encoding conversion routines)
-AC_CHECK_HEADERS(iconv.h)
 dnl defines HAVE_LANGINFO_H (GNU libc locale parameters)
 AC_CHECK_HEADERS(langinfo.h)
 
@@ -3096,23 +2829,9 @@ dnl check for available version of iconv()
 
 AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
-AC_CACHE_CHECK([if iconv() takes char**], wx_cv_iconv_takes_char,
-[
-    AC_TRY_COMPILE([#include <iconv.h>],
-    [
-        char **inbuf, **outbuf;
-        iconv_t cd;
-        size_t insz, outsz;
-        iconv(cd, inbuf, &insz, outbuf, &outsz);
-    ],
-    wx_cv_iconv_takes_char=yes,
-    wx_cv_iconv_takes_char=no)
-])
+AM_ICONV
+LIBS="$LIBICONV $LIBS"
 AC_LANG_RESTORE
-if test "$wx_cv_iconv_takes_char" = yes ; then
-    AC_DEFINE(WX_ICONV_TAKES_CHAR)
-fi
-
 
 dnl check for POSIX signals if we need them
 if test "$wxUSE_ON_FATAL_EXCEPTION" = "yes" -a "$wxUSE_UNIX" = "yes"; then
@@ -4982,8 +4701,10 @@ AC_SUBST(WXCONFIG_LIBS_STATIC)
 AC_SUBST(WXCONFIG_LIBS_STATIC_GL)
 AC_SUBST(WXCONFIG_INCLUDE)
 
-dnl what to compile
+dnl the list of files to compile/install
 AC_SUBST(ALL_OBJECTS)
+AC_SUBST(ALL_HEADERS)
+AC_SUBST(ALL_SOURCES)
 
 dnl distribution vars
 AC_SUBST(GUIDIST)
@@ -5038,6 +4759,7 @@ if test "$wxUSE_GUI" = "yes"; then
     dnl we need to pass SAMPLES_SUBDIRS (and some other) to the configure in
     dnl samples and the only way to do it is, again, use the cache
     wx_cv_path_samplesubdirs=$SAMPLES_SUBDIRS
+    wx_cv_if_gnu_make=$IF_GNU_MAKE
     wx_cv_path_ifs=$PATH_IFS
     wx_cv_program_ext=$PROGRAM_EXT
     wx_cv_target_library=$WX_TARGET_LIBRARY
@@ -5045,7 +4767,8 @@ if test "$wxUSE_GUI" = "yes"; then
     wx_cv_target_libtype=$WX_TARGET_LIBRARY_TYPE
     dnl we need to export them because passing them through cache won't
     dnl work when cache=/dev/null (which is default for autoconf 2.50)
-    export wx_cv_path_samplesubdirs wx_cv_path_ifs wx_cv_program_ext \
+    export wx_cv_path_samplesubdirs wx_cv_if_gnu_make \
+           wx_cv_path_ifs wx_cv_program_ext \
            wx_cv_target_library wx_cv_target_library_gl wx_cv_target_libtype
     AC_CONFIG_SUBDIRS(demos samples utils contrib)
 fi