Exclude based on opts

def _exclude(self, member):
        '''
        Exclude based on opts
        '''
        if isinstance(member, string_types):
            return None

        for item in self.opts['spm_build_exclude']:
            if member.name.startswith('{0}/{1}'.format(self.formula_conf['name'], item)):
                return None
            elif member.name.startswith('{0}/{1}'.format(self.abspath, item)):
                return None
        return member