--- ./Makefile.orig	2014-02-18 09:32:39.562743602 +0100
+++ ./Makefile	2014-02-18 09:32:58.145742130 +0100
@@ -42,5 +42,5 @@
 PREFIX ?= /usr/local
 
 install: niftyclean
-	$(INSTALL) -s clean $(PREFIX)/bin
-	$(INSTALL) clean.1 $(PREFIX)/man/man1
+	$(INSTALL) -s clean $(DESTDIR)$(PREFIX)/bin
+	$(INSTALL) clean.1 $(DESTDIR)$(MANPREFIX)/man/man1