--- Makefile.orig
+++ Makefile
@@ -1,4 +1,4 @@
-DESTDIR ?= /usr/local
+PREFIX ?= /usr/local
 
 MAN_MD = $(wildcard man/*.md)
 ROFFS = $(MAN_MD:.md=)
@@ -52,12 +52,11 @@
 	./test/direnv-test.sh
 
 install: all
-	install -d $(DESTDIR)/bin
-	install -d $(DESTDIR)/share/man/man1
-	install direnv $(DESTDIR)/bin
-	cp -R man/*.1 $(DESTDIR)/share/man/man1
+	install -d $(DESTDIR)$(PREFIX)/bin
+	install -d $(DESTDIR)$(PREFIX)/share/man/man1
+	install direnv $(DESTDIR)$(PREFIX)/bin
+	cp -R man/*.1 $(DESTDIR)$(PREFIX)/share/man/man1
 
 dist:
 	go get github.com/mitchellh/gox
 	gox -output "dist/direnv.{{.OS}}-{{.Arch}}"
-