--- Makefile.orig	2002-08-09 05:30:48.000000000 +0900
+++ Makefile	2007-12-06 19:02:31.000000000 +0900
@@ -1,5 +1,5 @@
-CC=cc
-CFLAGS=-O -w
+CC?=cc
+CFLAGS+=-w
 CLIB=-lm
 
 OBJ= phd2fasta.o \
