[psycopg] documentation build failure with python sphinx 1.6.3

Hi all,

with recent Fedora's sphinx packages, it seems to be a problem to build the
documentation in doc/ directory:

    $ make
    make_admonition

    WARNING: couldn't import psycopg to read version.
    WARNING: couldn't import psycopg to read version.
    /usr/lib/python3.6/site-packages/sphinx/util/compat.py:40:
    RemovedInSphinx17Warning: sphinx.util.compat.Directive is deprecated and
    will be removed in Sphinx 1.7, please use docutils' instead.
    RemovedInSphinx17Warning)

    Extension error:
    Could not import extension dbapi_extension (exception: cannot import name
    'make_admonition')
    /usr/lib/python3.6/site-packages/sphinx/util/compat.py:40:
    RemovedInSphinx17Warning: sphinx.util.compat.Directive is deprecated and
    will be removed in Sphinx 1.7, please use docutils' instead.
    RemovedInSphinx17Warning)

    Extension error:
    Could not import extension dbapi_extension (exception: cannot import name
    'make_admonition')

Is there some work-around for this?  We use python-sphinx-1.6.3.

Pavel