configure: Add a check for the DGifOpen function in the gif_lib.h header as the v4 of the file does define it, while v3 doesn't.

configure

@@ -14947,6 +14947,73 @@ fi
 fi
 
 
+if test "$ac_cv_header_gif_lib_h" = "yes"
+then
+    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <gif_lib.h>
+int
+main ()
+{
+static typeof(DGifOpen) * func;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag" || test ! -s conftest.err'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_GIF 1
+_ACEOF
+
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+
+
 EXTRACFLAGS=""
 
 if test "x${GCC}" = "xyes"

configure.ac

@@ -880,6 +880,14 @@ then
     AC_CHECK_LIB(capi20,capi20_register,[AC_DEFINE(HAVE_CAPI4LINUX,1,[Define if you have capi4linux libs and headers])])
 fi
 
+dnl **** Check for gif header usability ****
+
+if test "$ac_cv_header_gif_lib_h" = "yes"
+then
+    AC_TRY_COMPILE([#include <gif_lib.h>],[static typeof(DGifOpen) * func;],
+        AC_DEFINE(HAVE_GIF, 1, [Define if you have usable GIF headers]))
+fi
+
 dnl **** Check for gcc specific options ****
 
 AC_SUBST(EXTRACFLAGS,"")

dlls/oleaut32/olepicture.c

@@ -993,7 +993,7 @@ static boolean _jpeg_resync_to_restart(j_decompress_ptr cinfo, int desired) {
 static void _jpeg_term_source(j_decompress_ptr cinfo) { }
 #endif /* HAVE_JPEGLIB_H */
 
-#ifdef HAVE_GIF_LIB_H
+#ifdef HAVE_GIF
 
 static void *libungif_handle;
 #define MAKE_FUNCPTR(f) static typeof(f) * p##f
@@ -1040,12 +1040,12 @@ static int _gif_inputfunc(GifFileType *gif, GifByteType *data, int len) {
     return len;
 }
 
-#endif  /* HAVE_GIF_LIB_H */
+#endif  /* HAVE_GIF */
 
 
 static HRESULT OLEPictureImpl_LoadGif(OLEPictureImpl *This, BYTE *xbuf, ULONG xread)
 {
-#ifdef HAVE_GIF_LIB_H
+#ifdef HAVE_GIF
     struct gifdata 	gd;
     GifFileType 	*gif;
     BITMAPINFO		*bmi;

include/config.h.in

@@ -212,6 +212,9 @@
 /* Define to 1 if you have the `getuid' function. */
 #undef HAVE_GETUID
 
+/* Define if you have usable GIF headers */
+#undef HAVE_GIF
+
 /* Define to 1 if you have the <gif_lib.h> header file. */
 #undef HAVE_GIF_LIB_H