Re:

> Maybe this has something to do with the error. I have php5 and the path to
> the php file seems to be correct. PHP installed also some other files like
> phpize, phpextdist. I removed them. I don't know if they cause the
> problem.

Right. I had not tested mathopd with php5. PHP is known to break stuff with
each new version, so I cannot guarantee that every (or indeed *ANY*) version
of PHP will work.

Sorry I can't be more helpful.