From c9a14d1c38f6e4b5e9b5dc0ff7e47af9c017087d Mon Sep 17 00:00:00 2001
From: Nikolai Lifanov <lifanov@mail.lifanov.com>
Date: Wed, 31 May 2017 13:04:58 -0400
Subject: [PATCH] play nice with build systems that specify their own CC

FreeBSD ports system is one of these build systems and it manages -std=
settings and path to the correct compiler that may not be in PATH or called
"gcc" or "clang".
---
 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index a6f3af7..06857bf 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ GCCVERSIONGTEQ4 := $(shell expr `gcc -dumpversion | cut -f1 -d.` \>= 4)
 ifeq ($(UNAME_S),Linux)
 	LIBS=-lrt
 else ifeq "$(GCCVERSIONGTEQ4)" "1"
-	CC=c99
+	CC?=c99
 endif
 
 OBJS=main.o init.o actions1.o actions2.o score.o misc.o