Support DESTDIR.
--- cgi-src/Makefile.in.orig	2005-05-20 15:10:25.000000000 -0400
+++ cgi-src/Makefile.in	2014-10-01 17:12:40.000000000 -0400
@@ -67,17 +67,17 @@
 	cd .. ; $(MAKE) $(MFLAGS) strerror.o
 
 install:	all
-	-mkdir -p $(CGIBINDIR)
-	rm -f $(CGIBINDIR)/redirect
-	cp redirect $(CGIBINDIR)/redirect
-	rm -f $(MANDIR)/man8/redirect.8
-	cp redirect.8 $(MANDIR)/man8/redirect.8
-	rm -f $(CGIBINDIR)/ssi
-	cp ssi $(CGIBINDIR)/ssi
-	rm -f $(MANDIR)/man8/ssi.8
-	cp ssi.8 $(MANDIR)/man8/ssi.8
-	rm -f $(CGIBINDIR)/phf
-	cp phf $(CGIBINDIR)/phf
+	-mkdir -p $(DESTDIR)$(CGIBINDIR)
+	rm -f $(DESTDIR)$(CGIBINDIR)/redirect
+	cp redirect $(DESTDIR)$(CGIBINDIR)/redirect
+	rm -f $(DESTDIR)$(MANDIR)/man8/redirect.8
+	cp redirect.8 $(DESTDIR)$(MANDIR)/man8/redirect.8
+	rm -f $(DESTDIR)$(CGIBINDIR)/ssi
+	cp ssi $(DESTDIR)$(CGIBINDIR)/ssi
+	rm -f $(DESTDIR)$(MANDIR)/man8/ssi.8
+	cp ssi.8 $(DESTDIR)$(MANDIR)/man8/ssi.8
+	rm -f $(DESTDIR)$(CGIBINDIR)/phf
+	cp phf $(DESTDIR)$(CGIBINDIR)/phf
 
 clean:
 	rm -f $(CLEANFILES)