Fix sphinx build, hopefully.

doc/conf.py

@@ -20,14 +20,7 @@
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 sys.path.insert(0, os.path.abspath('..'))
 
-here = os.path.dirname(os.path.abspath(__file__))
-import versioneer
-versioneer.VCS = 'git'
-versioneer.versionfile_source = os.path.join(here, '../nevow/_version.py')
-versioneer.versionfile_build = '../nevow/_version.py'
-versioneer.tag_prefix = 'nevow-'
-versioneer.parentdir_prefix = 'Nevow-'
-
+from nevow import __version__
 
 # -- General configuration ------------------------------------------------
 
@@ -60,9 +53,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = versioneer.get_version()
+version = __version__
 # The full version, including alpha/beta/rc tags.
-release = version
+release = __version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.