'bundle_libzmq_dylib flag for whether external libzmq library will be included in pyzmq:
only relevant when not building libzmq extension'

@property
def bundle_libzmq_dylib(self):

    if ('bundle_libzmq_dylib' in self.config):
        return self.config['bundle_libzmq_dylib']
    elif ((sys.platform.startswith('win') or self.cross_compiling) and (not self.config['libzmq_extension'])):
        return True
    else:
        return False
