Adding intersphinx requirements

templates/sphinx-conf.py

@@ -216,8 +216,13 @@ autodoc_default_flags = [
   ]
 
 # For inter-documentation mapping:
-from bob.extension.utils import link_documentation
-intersphinx_mapping = link_documentation()
+from bob.extension.utils import link_documentation, load_requirements
+sphinx_requirements = "extra-intersphinx.txt"
+if os.path.exists(sphinx_requirements):
+    intersphinx_mapping = link_documentation(additional_packages=load_requirements(sphinx_requirements))
+else:
+    intersphinx_mapping = link_documentation()
+
 
 # We want to remove all private (i.e. _. or __.__) members
 # that are not in the list of accepted functions
@@ -237,4 +242,4 @@ def member_function_test(app, what, name, obj, skip, options):
   return False
 
 def setup(app):
-  app.connect('autodoc-skip-member', member_function_test)
\ No newline at end of file
+  app.connect('autodoc-skip-member', member_function_test)