[gthumb] gthumb ignores CFLAGS

[Paolo Bacchilega <paobac src gnome org>]

commit a2768ca25ed8b201464cc847dd62d368b2f373ee
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jan 7 14:38:22 2010 +0100

    gthumb ignores CFLAGS
    
    ...which is considered antisocial by distributors who want to enforce
    their own flags.
    
    [bug #606227]

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index f49b493..9a586cc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -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,