hg-2.3 build fails on fedora

[Neal Becker]

http://kojipkgs.fedoraproject.org//work/tasks/4091/4384091/build.log

relevant part is here:

make -C doc
make[1]: Entering directory `/builddir/build/BUILD/mercurial-2.3/doc'
python gendoc.py > hg.1.gendoc.txt.tmp
mv hg.1.gendoc.txt.tmp hg.1.gendoc.txt
touch hg.1.txt
python runrst hgmanpage  --halt warning \
  --strip-elements-with-class htmlonly hg.1.txt hg.1
Traceback (most recent call last):
  File "runrst", line 49, in <module>
    publish_cmdline(writer_name=writer)
  File "/usr/lib/python2.7/site-packages/docutils/core.py", line 349, in 
publish_cmdline
    pub.set_components(reader_name, parser_name, writer_name)
  File "/usr/lib/python2.7/site-packages/docutils/core.py", line 99, in 
set_components
    self.set_writer(writer_name)
  File "/usr/lib/python2.7/site-packages/docutils/core.py", line 88, in 
set_writer
    writer_class = writers.get_writer_class(writer_name)
  File "/usr/lib/python2.7/site-packages/docutils/writers/__init__.py", line 
136, in get_writer_class
    module = __import__(writer_name, globals(), locals(), level=1)
ImportError: No module named hgmanpage
make[1]: *** [hg.1] Error 1