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Subject[PATCH] changes.rst: explain the usage of virtual environment
As the Sphinx build seems very fragile, specially for
PDF output, add a notice about how to use it on a virtual

Signed-off-by: Mauro Carvalho Chehab <>

Documentation/process/changes.rst | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
index 3aed751e0cb5..8a51f37bce4a 100644
--- a/Documentation/process/changes.rst
+++ b/Documentation/process/changes.rst
@@ -322,6 +322,24 @@ PDF outputs, it is recommended to use version 1.4.6.
functionalities required for ``XeLaTex`` to work. For PDF output you'll also
need ``convert(1)`` from ImageMagick (

+Most distributions are shipped with Sphinx, but sometimes you may need
+to use a version different than the one shipped. For those cases, you
+can use Sphinx on a virtual environment. For example, if you want to
+install the Python 3 Sphinx version 1.4.9, do::
+ $ virtualenv-3 sphinx_1.4
+ $ . sphinx_1.4/bin/activate
+ $ pip install 'Sphinx==1.4.9'
+.. note::
+ #) It is recommended to use the RTD theme for html output. Depending
+ on the version, it should be installed in separate,
+ with ``pip install sphinx_rtd_theme``.
+ #) The command ``. sphinx_1.4/bin/activate`` sets the environment to
+ use the virtual environment you just install. It should be called
+ when you start a new shell, before running ``make htmldocs``.

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