Honour ${CC}
--- makefile.orig	Sun May 15 20:25:19 2011
+++ makefile	Sun May 15 20:25:25 2011
@@ -5,7 +5,7 @@
 #
 # makefile v0.03
 #
-CC = gcc -O1 -g -Wall
+CC ?= gcc -O1 -g -Wall
 #CC = gcc -g -Wall
 YACC = bison --defines --debug --report=all --yacc
 LEX = flex