$NetBSD$

--- Makefile.orig	2009-07-07 22:01:57.000000000 +0200
+++ Makefile
@@ -44,8 +44,8 @@ makedepend:
 include makedepend
 
 install: $(PROGRAM)
-	$(INSTALL) -s $(PROGRAM) $(bindir)/$(PROGRAM)
-	$(INSTALL) $(PROGRAM).$(MANPAGE) $(mandir)/man$(MANPAGE)/$(PROGRAM).$(MANPAGE)
+	$(INSTALL) -s $(PROGRAM) ${DESTDIR}$(bindir)/$(PROGRAM)
+	$(INSTALL) $(PROGRAM).$(MANPAGE) ${DESTDIR}$(mandir)/man$(MANPAGE)/$(PROGRAM).$(MANPAGE)
 
 uninstall:
 	-@ rm -f $(bindir)/$(PROGRAM)
