$NetBSD$

--- doc/Makefile.in.orig	2009-07-08 16:30:54.000000000 +0200
+++ doc/Makefile.in
@@ -18,10 +18,10 @@ distclean:
 	rm -f Makefile
 
 install-man:
-	$(MKINSTALLDIRS) $(MANDIR1)
-	$(MKINSTALLDIRS) $(MANDIR8)
-	$(INSTALL) -c -m 0644 thrulay.1 $(MANDIR1)
-	$(INSTALL) -c -m 0644 thrulayd.8 $(MANDIR8)
+	$(MKINSTALLDIRS) ${DESTDIR}$(MANDIR1)
+	$(MKINSTALLDIRS) ${DESTDIR}$(MANDIR8)
+	$(INSTALL) -c -m 0644 thrulay.1 ${DESTDIR}$(MANDIR1)
+	$(INSTALL) -c -m 0644 thrulayd.8 ${DESTDIR}$(MANDIR8)
 
 uninstall-man:
 	rm -f $(MANDIR1)/thrulay.1
