Not sure if you can read the picture....
/bin/ld: cannot find -lmosquitto
is the error.
I'm using centos 7
mosquitto-auth-plug config file has been updated with mosquitto src and openssl install directory and they are correct.
My previous error was mysql_config not found which I was able to fix by installing libmysqlclient-devel
mysql is installed and working fine
Let me know if you can help Thanks