pip: 从requirements.txt安装第三方库时报错:Specify MYSQLCLIENT_CFLAGS and MYSQLCLIENT_LDFLAGS env vars manually

一，报错信息 

      Exception: Can not find valid pkg-config name.
      Specify MYSQLCLIENT_CFLAGS and MYSQLCLIENT_LDFLAGS env vars manually

 

二，解决：

$ sudo yum install python3-devel mysql-devel pkgconfig