报错:
ld: library not found for -lssl
解决参考：https://github.com/PyMySQL/mysqlclient-python/issues/169
安装前定义这两个环境变量就好了
export LDFLAGS="-L/usr/local/opt/openssl/lib"
export CPPFLAGS="-I/usr/local/opt/openssl/include"
MAC 安装psycopg2报错ld: library not found for -lssl
原文：https://blog.51cto.com/cstsncv/2459130