From a22f5d8d8691dd12309ebdb613c01341b55da1c3 Mon Sep 17 00:00:00 2001
From: "Adam J. Stewart" <ajstewart426@gmail.com>
Date: Thu, 8 Sep 2016 11:02:56 -0500
Subject: [PATCH] Don't overwrite PYTHONPATH in docs Makefile (#1693)

---
 lib/spack/docs/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/spack/docs/Makefile b/lib/spack/docs/Makefile
index 95d26041b7..bdbdab7e8b 100644
--- a/lib/spack/docs/Makefile
+++ b/lib/spack/docs/Makefile
@@ -7,7 +7,7 @@ SPHINXBUILD   = sphinx-build
 PAPER         =
 BUILDDIR      = _build
 
-export PYTHONPATH = ../../spack
+export PYTHONPATH := ../../spack:$(PYTHONPATH)
 APIDOC_FILES  = spack*.rst
 
 # Internal variables.