--- Makefile.orig	2014-06-30 00:03:09.754282546 +0800
+++ Makefile	2014-06-30 00:03:37.920281904 +0800
@@ -36,10 +36,10 @@ all:    ./src/upsdaemon.c
 	${CC} ${CFLAGS} -o ./upsdaemon ./src/upsdaemon.c
 
 install:
-	${BSD_INSTALL_PROGRAM} ./upsdaemon ${SBINDIR}
-	${BSD_INSTALL_MAN} ./doc/upsdaemon.8 ${MANDIR}
-	mkdir -p ${SCRIPTDIR}
-	(cd scripts; for i in *; do ${BSD_INSTALL_SCRIPT} $$i ${SCRIPTDIR}; done; exit 0;)
+	${BSD_INSTALL_PROGRAM} ./upsdaemon $(DESTDIR)${SBINDIR}
+	${BSD_INSTALL_MAN} ./doc/upsdaemon.8 $(DESTDIR)${MANDIR}
+	mkdir -p $(DESTDIR)${SCRIPTDIR}
+	(cd scripts; for i in *; do ${BSD_INSTALL_SCRIPT} $$i $(DESTDIR)${SCRIPTDIR}; done; exit 0;)
 
 clean:
 	rm -f ./upsdaemon