I have one model printer that I cannot get the driver to install on OS X 10.5 for.

The HP Color LaserJet 5550. I keep getting "The filter specified in the PPD could not be found/resolved"

I have tried drivers from the following sources:
the OS X 10.5 install itself
New drivers from HP
Old drivers from an old Iprint server (Netware)
PPD drivers from the hplip project.

The server is a OES2 Linux server. Other OS X driver for other printers are installing OK.

Thanks for any help.