安装locust时报错，求大神解决！！！

Question

Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/nf/d5lnw83j7kv05wnkj7qp3rm4nsmpfq/T/pip-install-b0OOcq/greenlet/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /private/var/folders/nf/d5lnw83j7kv05wnkj7qp3rm4nsmpfq/T/pip-record-07TaRe/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/nf/d5lnw83j7kv05wnkj7qp3rm4nsmpfq/T/pip-install-b0OOcq/greenlet/