--- liblua/Makefile.orig	2016-07-02 17:02:27 UTC
+++ liblua/Makefile
@@ -6,8 +6,8 @@
 # Your platform. See PLATS for possible values.
 PLAT= none
 
-CC= gcc -std=gnu99
-CFLAGS= -O2 -Wall -Wextra -DLUA_COMPAT_5_2 $(SYSCFLAGS) $(MYCFLAGS)
+CC?= gcc -std=gnu99
+CFLAGS= -Wall -Wextra -DLUA_COMPAT_5_2 $(SYSCFLAGS) $(MYCFLAGS)
 LDFLAGS= $(SYSLDFLAGS) $(MYLDFLAGS)
 LIBS= -lm $(SYSLIBS) $(MYLIBS)