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Allowed overriding variables in docs/Makefile.

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1 parent 33e6cf5 commit c694e6220ec78ed28ec7f621035ec21c8923a0c1 @minusf minusf committed with timgraham Jul 28, 2013
Showing with 5 additions and 5 deletions.
  1. +5 −5 docs/Makefile
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10 docs/Makefile
@@ -2,11 +2,11 @@
#
# You can set these variables from the command line.
-SPHINXOPTS =
-SPHINXBUILD = sphinx-build
-PAPER =
-BUILDDIR = _build
-LANGUAGE =
+SPHINXOPTS ?=
+SPHINXBUILD ?= sphinx-build
+PAPER ?=
+BUILDDIR ?= _build
+LANGUAGE ?=
# Internal variables.
PAPEROPT_a4 = -D latex_paper_size=a4

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