$OpenBSD: patch-Makefile,v 1.1 2014/03/25 17:52:18 sthen Exp $
--- Makefile.orig	Mon Mar 27 21:38:37 2006
+++ Makefile	Tue Mar 25 17:41:56 2014
@@ -4,7 +4,8 @@ PNG	= yes
 
 
 CC	= gcc
-CFLAGS	= -O2 -g -Wall `pkg-config gtk+-2.0 --cflags`
+myCFLAGS	?= -O2 -g
+CFLAGS	= ${myCFLAGS} -Wall `pkg-config gtk+-2.0 --cflags`
 
 LD	= $(CC)
 LDFLAGS	= `pkg-config gtk+-2.0 --libs` -lm
