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-rw-r--r--doc/developer/Makefile6
-rw-r--r--doc/user/Makefile6
2 files changed, 6 insertions, 6 deletions
diff --git a/doc/developer/Makefile b/doc/developer/Makefile
index 640a1ace38..f5e7cb60ec 100644
--- 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 640a1ace38..f5e7cb60ec 100644
--- 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