--- Makefile.orig	Fri Mar  7 05:19:01 1997
+++ Makefile	Sun Mar 31 15:47:22 2002
@@ -2,8 +2,8 @@
 # simple Makefile to compile and install flow
 #
 
-CC	= gcc
-CFLAGS	= -O2 -Wall
+CC	?= gcc
+CFLAGS	+= -Wall
 MANPATH	= /usr/man
 PREFIX	= /usr/bin
 
@@ -17,4 +17,4 @@
 	cp flow $(PREFIX); cp flow.1 $(MANPATH)/man1
 
 clean:
-	rm flow flow.o
+	rm flow flow.o