@classmethod<EOL><INDENT>def _build_master(cls):<DEDENT>
ws = cls()<EOL>try:<EOL><INDENT>from __main__ import __requires__<EOL><DEDENT>except ImportError:<EOL><INDENT>return ws<EOL><DEDENT>try:<EOL><INDENT>ws.require(__requires__)<EOL><DEDENT>except VersionConflict:<EOL><INDENT>return cls._build_from_requirements(__requires__)<EOL><DEDENT>return ws<EOL>
Prepare the master working set.