MarsSeed [1] filed a deletion request for python2-sphinxcontrib- serializinghtml [2]: Unneeded Python2 module for the broken python2-sphinx documentation builder. The Python3 based sphinx from repo can be used to build the documentation of Python2 packages. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/python2-sphinxcontrib-serializinghtml/