flask-mysqldb安装时EnvironmentError: mysql_config not found

　　安装时候的日志如下：

sh: 1: mysql_config: not found
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-KZJ2c6/mysqlclient/setup.py", line 17, in <module>
        metadata, options = get_config()
      File "/tmp/pip-build-KZJ2c6/mysqlclient/setup_posix.py", line 44, in get_config
        libs = mysql_config("libs_r")
      File "/tmp/pip-build-KZJ2c6/mysqlclient/setup_posix.py", line 26, in mysql_config
        raise EnvironmentError("%s not found" % (mysql_config.path,))
    EnvironmentError: mysql_config not found
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-KZJ2c6/mysqlclient/

　　错误解决方案：

　　１.检查系统是否安装了libmysqlclient-dev，没有安装的话使用sudo apt-get install libmysqlclient-dev安装

　　２.sudo updatedb，locate mysql_config找到mysql_config的安装目录/usr/bin/mysql_config

　　３.在mysql-python源码包下找到：setup_posix.py 文件，然后找到文件中的 mysql_config.path 将其值改为：/usr/bin/mysql_config,然后 sudo python setup.py install

　　４.重新安装flask-mysqldb　pip install flask-mysqldb