--- ext/cpm/Makefile.orig	2018-08-30 03:00:18 UTC
+++ ext/cpm/Makefile
@@ -12,7 +12,7 @@ else
   EXE 		:=
 endif
 
-CC = gcc
+CC ?= gcc
 CFLAGS = -g -pipe -Wall -DPOSIX_TTY -DLITTLE_ENDIAN -DMEM_BREAK
 LDFLAGS =