diff -Nur yquake2-QUAKE2_5_34/Makefile new/Makefile
--- yquake2-QUAKE2_5_34/Makefile	2016-06-25 10:28:42.000000000 +0200
+++ new/Makefile	2016-07-19 11:18:06.896494476 +0200
@@ -154,7 +154,7 @@
 		  -Wall -pipe -g -fwrapv
 CFLAGS += $(OSX_ARCH)
 else
-CFLAGS := -O2 -fno-strict-aliasing -fomit-frame-pointer \
+CFLAGS := $(CFLAGS) -O2 -fno-strict-aliasing -fomit-frame-pointer \
 		  -Wall -pipe -g -ggdb -MMD -fwrapv
 endif