$OpenBSD: patch-Makefile,v 1.1 2017/03/14 10:43:23 fcambus Exp $
--- Makefile.orig	Fri Oct 10 15:54:48 2014
+++ Makefile	Mon Mar 13 17:25:21 2017
@@ -24,8 +24,8 @@ QMAKE_EXTRA := -spec macx-g++
 endif
 
 # Set basic flags, these can be overridden from the environment
-CFLAGS = -O2
-CXXFLAGS = -O2
+CFLAGS ?= -O2
+CXXFLAGS ?= -O2
 
 # Add CPPFLAGS
 CFLAGS += $(CPPFLAGS)
