updates for sphinx build to run correctly

Change-Id: Ibd3227c57d334200e40f6184a577cf34d1d03cbb

diff --git a/doc/build/requirements.txt b/doc/build/requirements.txt
index 9b9bffd36e53eb1a9e6a91193f06c19de28de7cf..7ad5825770e1cc110fc90b0d36f69484f8c4a630 100644 (file)
--- a/doc/build/requirements.txt
+++ b/doc/build/requirements.txt
@@ -3,4 +3,5 @@ git+https://github.com/sqlalchemyorg/sphinx-paramlinks.git#egg=sphinx-paramlinks
 git+https://github.com/sqlalchemyorg/zzzeeksphinx.git#egg=zzzeeksphinx
 sphinx-copybutton==0.5.1
 sphinx-autobuild
-typing-extensions
+typing-extensions  # for autodoc to be able to import source files
+greenlet  # for autodoc to be able to import sqlalchemy source files