--- Makefile.orig	Tue Jul  6 15:38:07 1999
+++ Makefile	Tue Aug 10 00:24:52 1999
@@ -1,7 +1,8 @@
 
 SHELL=/bin/sh
-CC=gcc
-CFLAGS=-Wall -Winline -O2 -fomit-frame-pointer -fno-strength-reduce
+CC?=gcc
+CFLAGS?=-O2
+CFLAGS+=-Wall -Winline -fomit-frame-pointer -fno-strength-reduce
 
 OBJS= blocksort.o  \
       huffman.o    \