doc: allow env var to ovveride sphinx defaults

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

diff --git a/doc/developer/Makefile b/doc/developer/Makefile
index 640a1ace38da6ab8280fae7041ee8653eec6e50e..f5e7cb60ec09878bfc3448283f30769b3b2b3e87 100644 (file)
--- a/doc/developer/Makefile
+++ b/doc/developer/Makefile
@@ -2,9 +2,9 @@
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
-SPHINXBUILD   = sphinx-build
-PAPER         =
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+PAPER         ?=
 BUILDDIR      = _build
 
 # User-friendly check for sphinx-build

diff --git a/doc/user/Makefile b/doc/user/Makefile
index 640a1ace38da6ab8280fae7041ee8653eec6e50e..f5e7cb60ec09878bfc3448283f30769b3b2b3e87 100644 (file)
--- a/doc/user/Makefile
+++ b/doc/user/Makefile
@@ -2,9 +2,9 @@
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
-SPHINXBUILD   = sphinx-build
-PAPER         =
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+PAPER         ?=
 BUILDDIR      = _build
 
 # User-friendly check for sphinx-build