--- Makefile.orig	2002-07-03 13:22:08.000000000 +0800
+++ Makefile	2014-06-27 00:45:38.945108983 +0800
@@ -1,8 +1,8 @@
 
-CFLAGS = -Wall -O
+CFLAGS += -Wall
 
-CC = gcc
-DESTDIR=/usr/local
+CC ?= gcc
+#DESTDIR= ${PREFIX}
 
 all: flasher man
 
@@ -16,8 +16,8 @@ man: flasher.1.gz
 
 install: flasher man
 	strip flasher
-	install flasher $(DESTDIR)/sbin/flasher
-	install flasher.1.gz $(DESTDIR)/man/man1
+	install flasher $(DESTDIR)${PREFIX}/sbin/flasher
+	install flasher.1.gz $(DESTDIR)${PREFIX}/man/man1
 	
 clean:
 	rm -f *.o flasher flasher.1.gz