def _with(self, option=None):
if option is None:<EOL><INDENT>return (<EOL>(k, v) for k, v in self.env.items()<EOL>if k.startswith('<STR_LIT>')<EOL>)<EOL><DEDENT>return self.env.get('<STR_LIT>' + option.upper()) == True<EOL>
Check if a build option is enabled.

        If called without argument, it returns all WITH_* items.

        Example:

            {% if with('foo') %}...{% endif %}