--- Makefile.orig	2003-03-22 05:58:00.000000000 +0800
+++ Makefile	2014-06-29 22:39:49.234628215 +0800
@@ -2,7 +2,7 @@
 # Written by Stanislav Shalunov.
 # $Id: Makefile,v 1.6 2003/03/21 21:58:00 shalunov Exp $
 
-PREFIX=/usr/local
+PREFIX?=/usr/local
 BINDIR=$(PREFIX)/sbin
 MANDIR=$(PREFIX)/man/man8
 
@@ -11,10 +11,10 @@ CFLAGS += -O6 -Wall -W -pedantic
 all:		stmpclean stmpclean.0
 
 install:	all
-	if [ ! -d $(BINDIR) ] ; then mkdir -p -m 0755 $(BINDIR); fi
-	if [ ! -d $(MANDIR) ] ; then mkdir -p -m 0755 $(MANDIR); fi
-	install -c -o 0 -g 0 -m 0555 stmpclean $(BINDIR)/
-	install -c -o 0 -g 0 -m 0444 stmpclean.8 $(MANDIR)/
+	if [ ! -d $(DESTDIR)$(BINDIR) ] ; then mkdir -p -m 0755 $(DESTDIR)$(BINDIR); fi
+	if [ ! -d $(DESTDIR)$(MANDIR) ] ; then mkdir -p -m 0755 $(DESTDIR)$(MANDIR); fi
+	$(BSD_INSTALL_PROGRAM) stmpclean $(DESTDIR)$(BINDIR)/
+	$(BSD_INSTALL_MAN) stmpclean.8 $(DESTDIR)$(MANDIR)/
 
 stmpclean.o:	stmpclean.c