def have_environment_marker_support():
try:<EOL><INDENT>from pkg_resources import parse_version<EOL>from setuptools import __version__<EOL>return parse_version(__version__) >= parse_version('<STR_LIT>')<EOL><DEDENT>except Exception:<EOL><INDENT>return False<EOL><DEDENT>
Check whether setuptools has support for PEP-426 environment marker support.

Based on the ``setup.py`` script of the ``pytest`` package:
https://bitbucket.org/pytest-dev/pytest/src/default/setup.py