--- Makefile.orig	2017-05-15 07:49:44 UTC
+++ Makefile
@@ -120,8 +120,8 @@ clean::
 
 install:
 	mkdir -p $(prefix) $(bindir)
-	$(INSTALL) -m 755 halibut $(bindir)/halibut
-	$(MAKE) -C ../doc install prefix="$(prefix)" INSTALL="$(INSTALL)"
+	$(INSTALL) -m 755 halibut $(DESTDIR)$(bindir)/halibut
+	$(MAKE) -C ../doc install prefix="$(DESTDIR)$(prefix)" INSTALL="$(INSTALL)"
 
 FORCE: # phony target to force version.o to be rebuilt every time