This should work better. Thanks to Jon Wagoner <jwagoner@wlion.com>

diff --git a/ext/fdf/config.m4 b/ext/fdf/config.m4
index 2f2cf1e0767063e5ae029f04bc830ff3fe0e8f2b..62a51a0221fde40d31279e8cffb37e38f345bb8b 100644 (file)
--- a/ext/fdf/config.m4
+++ b/ext/fdf/config.m4
@@ -28,8 +28,8 @@ if test "$PHP_FDFTK" != "no"; then
     AC_CHECK_LIB($i, FDFOpen, [FDFLIBRARY=$i], [], [-L$FDFTK_DIR/lib -lm])
   done
   
-  if test $FDFLIBRARY = ""; then
-    AC_MSG_ERROR(fdftk module requires fdftk 2.0)
+  if test -z "$FDFLIBRARY"; then
+    AC_MSG_ERROR(fdftk module requires >= fdftk 2.0)
   fi
   
   AC_DEFINE(HAVE_FDFLIB,1,[ ])