diff -up gthumb-2.11.1/configure.ac.cflags gthumb-2.11.1/configure.ac
--- gthumb-2.11.1/configure.ac.cflags	2010-01-04 11:33:06.000000000 -0500
+++ gthumb-2.11.1/configure.ac	2010-01-06 12:36:05.272547516 -0500
@@ -37,8 +37,8 @@ UNIQUE_REQUIRED=1.1.2
 
 dnl ===========================================================================
 
-CFLAGS=""
-CFLAGS+="-DG_DISABLE_SINGLE_INCLUDES -DGDK_PIXBUF_DISABLE_SINGLE_INCLUDES -DGTK_DISABLE_SINGLE_INCLUDES "
+CFLAGS=${CFLAGS-:""}
+CFLAGS+=" -DG_DISABLE_SINGLE_INCLUDES -DGDK_PIXBUF_DISABLE_SINGLE_INCLUDES -DGTK_DISABLE_SINGLE_INCLUDES "
 CFLAGS+="-DG_DISABLE_DEPRECATED -DGDK_DISABLE_DEPRECATED -DGDK_PIXBUF_DISABLE_DEPRECATED -DGTK_DISABLE_DEPRECATED "
 
 AC_ARG_ENABLE(debug,