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-rw-r--r--lib/spack/docs/Makefile2
1 files changed, 1 insertions, 1 deletions
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.