⟫ head -n 1 debian/changelog 
nova (2:14.0.0~b3~dev17-0ubuntu1) UNRELEASED; urgency=medium

⟫ sbuild -A -d yakkety-amd64 nova*.dsc
...
sphinx-build -b man doc/source doc/build/man
Running Sphinx v1.4.5

Exception occurred:
  File "/usr/lib/python2.7/dist-packages/pbr/version.py", line 181, in _parse_type
    return prerelease_type, int(prerelease)
ValueError: invalid literal for int() with base 10: '3~dev17'
The full traceback has been saved in /tmp/sphinx-err-YxrzhB.log, if you want to report the issue to the developers.
Please also report this if it was a user error, so that a better error message can be provided next time.
A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!
debian/rules:26: recipe for target 'override_dh_auto_build' failed
make[1]: *** [override_dh_auto_build] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
debian/rules:13: recipe for target 'build' failed
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2
--------------------------------------------------------------------------------
Build finished at 20160719-0903