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-rw-r--r--lib/spack/docs/Makefile3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/spack/docs/Makefile b/lib/spack/docs/Makefile
index 1b56959aad..bcba423d94 100644
--- a/lib/spack/docs/Makefile
+++ b/lib/spack/docs/Makefile
@@ -3,7 +3,8 @@
# You can set these variables from the command line.
SPHINXOPTS = -E
-SPHINXBUILD = sphinx-build
+JOBS ?= $(shell python -c 'import multiprocessing; print multiprocessing.cpu_count()')
+SPHINXBUILD = sphinx-build -j $(JOBS)
PAPER =
BUILDDIR = _build