'Request inclusion of feature named \'name\''

def include_feature(self, name):

    if (self.feature_is_included(name) == 0):
        descr = self.features[name].description
        raise DistutilsOptionError((descr + '    is    required,    but    was    excluded    or    is    not    available'))
    self.features[name].include_in(self)
    self._set_feature(name, 1)
