installing php with pear

Hi there,

I am trying to get pear:DB running. So I first tried to install it via command 
line like on the pear site described. Besides that the list command says it is 
installed, I found that it is not since the db functions are not known by php.

So I called php.info and found that there is no mentioning from pear. Than I 
installed the newest 4.x version of php '--with-PEAR'. But that did not help 
either. There is no section inside the phpinfo file which says anything about 
that pear is enabled and the functions are still not available.

Can anybody help please?

Thank you in advance, Merlin