fixed no-gtk build bug introduced with e2d898cc

diff --git a/configure.ac b/configure.ac
index ffc9cff9a0e23d66d1f5606b0d98a79eeba3924b..2859e679bc4ae14fa4c2a7bc33cf2d06d07a0eee 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -93,7 +93,7 @@ AS_IF([test "x$WANTS_GTK" = "xyes"], [
     GTK_OBJ=""
   ])
 ], [
-  AC_DEFINE([NO_GTK])
+  AC_DEFINE([NO_GTK], [1], [Define if you don't have the GTK+ libraries available.])
   GTK_OBJ=""
 ])