From 75ec57d90f4b8169c5bcb9666b5bae38800b03ca Mon Sep 17 00:00:00 2001
From: Elliot Saba <staticfloat@gmail.com>
Date: Mon, 8 Aug 2016 17:24:07 -0700
Subject: [PATCH] Set optimization level only if not already overridden

---
 Make.inc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Make.inc b/Make.inc
index cca2ca7..e4c50b2 100644
--- a/Make.inc
+++ b/Make.inc
@@ -99,8 +99,10 @@ ifeq ($(ARCH),x86_64)
 override ARCH := amd64
 endif
 
-# The optimization flag may be overriden with the environment variable CFLAGS.
-CFLAGS ?= -O3
+# If CFLAGS does not contain a -O optimization flag, default to -O3
+ifeq ($(findstring -O,$(CFLAGS)),)
+CFLAGS_add += -O3
+endif
 
 ifneq (,$(findstring MINGW,$(OS)))
 override OS=WINNT