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Subject[PATCH 3/6] sphinx.rst: explain the usage of virtual environment
Date
As the Sphinx build seems very fragile, specially for
PDF output, add a notice about how to use it on a virtual
environment.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
---
Documentation/doc-guide/sphinx.rst | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

diff --git a/Documentation/doc-guide/sphinx.rst b/Documentation/doc-guide/sphinx.rst
index 1ee109b19322..3278262164da 100644
--- a/Documentation/doc-guide/sphinx.rst
+++ b/Documentation/doc-guide/sphinx.rst
@@ -28,6 +28,38 @@ The ReST markups currently used by the Documentation/ files are meant to be
built with ``Sphinx`` version 1.3 or upper. If you're desiring to build
PDF outputs, it is recommended to use version 1.4.6 or upper.

+Most distributions are shipped with Sphinx, but its toolchain is fragile,
+and it is not uncommon that upgrading it or some other Python packages
+on your machine would cause the documentation build to break.
+
+A way to get rid of that is to use a different version than the one shipped
+on your distributions. In order to do that, it is recommended to install
+Sphinx inside a virtual environment, using ``virtualenv-3``
+or ``virtualenv``, depending on how your distribution packaged Python 3.
+
+.. note::
+
+ #) Sphinx versions below 1.5 don't work properly with Python's
+ docutils version 0.13.1 or upper. So, if you're willing to use
+ those versions, you should run ``pip install 'docutils==0.12'``.
+
+ #) It is recommended to use the RTD theme for html output. Depending
+ on the Sphinx version, it should be installed in separate,
+ with ``pip install sphinx_rtd_theme``.
+
+In summary, if you want to install Sphinx version 1.4.9, you should do::
+
+ $ virtualenv sphinx_1.4
+ $ . sphinx_1.4/bin/activate
+ (sphinx_1.4) $ pip install 'docutils==0.12'
+ (sphinx_1.4) $ pip install 'Sphinx==1.4.9'
+ (sphinx_1.4) $ pip install sphinx_rtd_theme
+
+After running ``. sphinx_1.4/bin/activate``, the prompt will change,
+in order to indicate that you're using the new environment. If you
+open a new shell, you need to rerun this command to enter again at
+the virtual environment before building the documentation.
+
.. note::

Please notice that, for PDF and LaTeX output, you'll also need ``XeLaTeX``
--
2.13.0
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