系统：macOS Sierra
pip install MySQL-python, pip install psycopg2均报以下错误：
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
error: command 'cc' failed with exit status 1报错显示没有找到lssl这个库，我用Google搜索how to install lssl on mac 还是没有找到如何安装呀，请问这个问题我该怎么解决？谢谢
