Delete virtualenv faq.

anntzer · anntzer · commit f199e083c4f5 · 2019-07-31T19:57:16.000+02:00
The situation has basically improved to the point where it's just "it
works, though installing some GUI toolkits may be a bit tricky."
Mention these tricky points in INSTALL.rst instead.
diff --git a/INSTALL.rst b/INSTALL.rst
@@ -143,17 +143,24 @@ optional Matplotlib backends and the capabilities they provide.
 * `Tk <https://docs.python.org/3/library/tk.html>`_ (>= 8.3, != 8.6.0 or
   8.6.1): for the Tk-based backends;
 * `PyQt4 <https://pypi.org/project/PyQt4>`_ (>= 4.6) or
-  `PySide <https://pypi.org/project/PySide>`_ (>= 1.0.3): for the Qt4-based
-  backends;
+  `PySide <https://pypi.org/project/PySide>`_ (>= 1.0.3) [#]_: for the
+  Qt4-based backends;
 * `PyQt5 <https://pypi.org/project/PyQt5>`_: for the Qt5-based backends;
 * `PyGObject <https://pypi.org/project/PyGObject/>`_: for the GTK3-based
+  backends [#]_;
+* `wxPython <https://www.wxpython.org/>`_ (>= 4) [#]_: for the wx-based
   backends;
-* `wxPython <https://www.wxpython.org/>`_ (>= 4): for the WX-based backends;
 * `cairocffi <https://cairocffi.readthedocs.io/en/latest/>`_ (>= 0.8) or
   `pycairo <https://pypi.org/project/pycairo>`_: for the cairo-based
   backends;
 * `Tornado <https://pypi.org/project/tornado>`_: for the WebAgg backend;
 
+.. [#] PySide cannot be pip-installed on Linux (but can be conda-installed).
+.. [#] If using pip (and not conda), PyGObject must be built from source; see
+       https://pygobject.readthedocs.io/en/latest/devguide/dev_environ.html.
+.. [#] If using pip (and not conda) on Linux, wxPython wheels must be manually
+       downloaded from https://wxpython.org/pages/downloads/.
+
 For better support of animation output format and image file formats, LaTeX,
 etc., you can install the following:
 
diff --git a/doc/faq/index.rst b/doc/faq/index.rst
@@ -18,4 +18,3 @@ The Matplotlib FAQ
    howto_faq.rst
    troubleshooting_faq.rst
    environment_variables_faq.rst
-   virtualenv_faq.rst
diff --git a/doc/faq/virtualenv_faq.rst b/doc/faq/virtualenv_faq.rst
