mysql_config not found

  File "<string>", line 1, in <module>
      File "/private/var/folders/2f/r1pwfcp521q7z9kd240tr3700000gn/T/pip-build-u8yhUI/mysqlclient/setup.py", line 17, in <module>
        metadata, options = get_config()
      File "setup_posix.py", line 54, in get_config
        libraries = [dequote(i[2:]) for i in libs if i.startswith('-l')]
      File "setup_posix.py", line 12, in dequote
        if s[0] in "\"'" and s[0] == s[-1]:
    IndexError: string index out of range

# Create options 
libs="-L$pkglibdir"
libs="$libs -l "

# 修改后，如下

# Create options 
libs="-L$pkglibdir"
libs="$libs -lmysqlclient -lssl -lcrypto"