--- Makefile.orig	2016-09-22 14:35:52.000000000 -0700
+++ Makefile	2016-09-22 14:44:40.000000000 -0700
@@ -20,7 +20,7 @@
 #  Initial work done by Joseph Coffland and Julian Devlin.
 #  Numerous further improvements by Baron Roberts.
 CXX=g++
-PREFIX=/usr
+PREFIX=$(JHBUILD_PREFIX)
 
 SUFFIX=
 CXXFLAGS=-Wall