If the user requested specific DocBooks to be built using 'make
DOCBOOKS=foo.xml htmldocs', assume no Sphinx build is desired. This
check is transitional, and can be removed once we drop the DocBook
build.

Cc: Markus Heiser <markus.hei...@darmarit.de>
Cc: Mauro Carvalho Chehab <mche...@osg.samsung.com>
Fixes: 22cba31bae9d ("Documentation/sphinx: add basic working Sphinx 
configuration and build")
Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
 Documentation/Makefile.sphinx | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/Makefile.sphinx b/Documentation/Makefile.sphinx
index 6c203745b6c6..d8d13c92a178 100644
--- a/Documentation/Makefile.sphinx
+++ b/Documentation/Makefile.sphinx
@@ -17,6 +17,12 @@ ifeq ($(HAVE_SPHINX),0)
        $(warning The '$(SPHINXBUILD)' command was not found. Make sure you 
have Sphinx installed and in PATH, or set the SPHINXBUILD make variable to 
point to the full path of the '$(SPHINXBUILD)' executable.)
        @echo "  SKIP    Sphinx $@ target."
 
+else ifneq ($(DOCBOOKS),)
+
+# Skip Sphinx build if the user explicitly requested DOCBOOKS.
+.DEFAULT:
+       @echo "  SKIP    Sphinx $@ target (DOCBOOKS specified)."
+
 else # HAVE_SPHINX
 
 # User-friendly check for rst2pdf
-- 
2.1.4

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