-setup_requires = []
-
-# Nevow imports itself when building, which causes Twisted and zope.interface
-# to be imported. We need to make sure that the versions of Twisted and
-# zope.interface used at build time satisfy Nevow's requirements. If not
-# then there are two problems:
-# - prior to Nevow v0.9.33, Nevow didn't declare its dependency on Twisted
-# in a way that enabled setuptools to satisfy that requirement at
-# build time.
-# - some versions of zope.interface, e.g. v3.6.4, are incompatible with
-# Nevow, and we need to avoid those both at build and run-time.
-#
-# This only matters when compatible versions of Twisted and zope.interface
-# are not already installed. Retire this hack when
-# https://bugs.launchpad.net/nevow/+bug/812537 has been fixed.
-setup_requires += [req for req in install_requires if req.startswith('Twisted') or req.startswith('zope.interface')]
-