PHP License Questions

Hi all! Many PEAR libraries are licensed under the PHP license. I'm using a few of these (right now, DB and Calendar) in a project that will eventually be released under the GPL. A member of the GNU Savannah development team (i.e. a reputable source) recently mentioned that the GPL was incompatible with the PHP license (verified by http://www.gnu.org/licenses/license-list.html#GPLIncompatibleLicenses ) and that using code under the PHP license in a GPL'ed piece of software could not mesh. This is one of his quotes as to the conflict (referring to the PHP license): "ah, I would guess the advertising clause, that and how it's not definitive enough with your rights." I know that the PHP license is basically a BSD license with a few clauses about the 'PHP' name, so this confuses me. I'm also extremely confused because I *know* many GPL'ed pieces of software use PEAR libraries under the PHP license. Is this just a matter of no enforcement or is he mistaken? If he's mistaken, can someone elaborate so I can refute his argument? I don't mean any offense to the developer I refer to or anyone else; I'm just concerned about what this means to my project. Thanks much all --Andrew Lindeman