--- configure.orig	2002-08-19 20:21:52.000000000 -0500
+++ configure	2011-04-19 02:58:33.000000000 -0500
@@ -1373,7 +1373,7 @@
 HAVE_ZLIB_H=0
 
 includedir="-I. -I./libs"
-CFLAGS="-g -Wall"
+CFLAGS="$CFLAGS -g -Wall"
 LIBS="-Llibs -lslm"
 
 if test "$enable_zlib" -a "$HAVE_ZLIB_H"; then