--- Makefile.in.orig	2014-06-09 11:38:16.905011836 +0800
+++ Makefile.in	2014-06-09 11:38:39.412011484 +0800
@@ -36,7 +36,7 @@ tar:	distclean
 	gzip -9 icmpmonitor-$(VERSION).tar)
 
 install: icmpmonitor icmpmonitor.man
-	$(top_srcdir)/mkinstalldirs $(sbindir)
-	$(INSTALL) icmpmonitor $(sbindir)
-	$(top_srcdir)/mkinstalldirs $(mandir)/man1
-	$(INSTALL) icmpmonitor.man $(mandir)/man1/icmpmonitor.1
+	$(top_srcdir)/mkinstalldirs $(DESTDIR)$(sbindir)
+	$(INSTALL) icmpmonitor $(DESTDIR)$(sbindir)
+	$(top_srcdir)/mkinstalldirs $(DESTDIR)$(mandir)/man1
+	$(INSTALL) icmpmonitor.man $(DESTDIR)$(mandir)/man1/icmpmonitor.1