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reading sources... [ 5%] devel/clients/libtizgmusic
File "/usr/local/lib/python2.7/dist-packages/docutils/transforms/universal.py", line 294, in apply
AttributeError: 'NoneType' object has no attribute 'replace'
The full traceback has been saved in /tmp/sphinx-err-xeWXWM.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!
Makefile:45: recipe for target 'html' failed