--- Makefile.orig	2000-04-21 05:15:07.000000000 +0800
+++ Makefile	2013-11-09 19:38:12.000000000 +0800
@@ -1,10 +1,10 @@
-CC=gcc
-CFLAGS=-O3
+CC?=gcc
+CFLAGS?=-O3
 #CFLAGS=-O3 -Wall -Wtraditional -Wstrict-prototypes -Wmissing-prototypes -pedantic -ansi
 #CFLAGS=-g -Wall -Wtraditional -Wstrict-prototypes -Wmissing-prototypes -pedantic -ansi
 TARGET=fortunelock
 LIBS=-lncurses
-PREFIXDIR=/usr/local
+PREFIX?=/usr/local
 
 all: $(TARGET)
 
@@ -19,8 +19,8 @@ fortunelock.o: fortunelock.c fortunelock
 
 install: 
 	strip fortunelock
-	install -m 755 fortunelock $(PREFIXDIR)/bin
-	install -m 644 fortunelock.1 $(PREFIXDIR)/man/man1
+	install -c -m 755 fortunelock $(DESTDIR)$(PREFIX)/bin
+	install -c -m 644 fortunelock.1 $(DESTDIR)$(PREFIX)/man/man1
 
 uninstall:
-	rm -rf $(PREFIXDIR)/bin/fortunelock
+	rm -rf $(PREFIX)/bin/fortunelock