Thank you both for your help on this. I've followed Lester's suggestion and upgraded my php
install to the latest binary from entropy.ch (5.2.4).

--- In firebird-php@yahoogroups.com, Milan Babuskov <milanb@...> wrote:
> Obviously, Firebird is not installed in /opt/firebird on OS X. I don't
> have any experience with Mac, but the main issue is allowing configure
> script to find libgds and libib_util.

After upgrading php I downloaded the php-5.2.4 source and went through the steps again. I
was able to get the configure command to complete with the following:

$ ./configure --with-
interbase=shared,/Library/Frameworks/Firebird.framework/Versions/A/Libraries

The next step (make) has failed though, with a huge number of warnings and errors. I've
uploaded the output to: http://blogtender.com/ib-make-output.txt

Any suggestions on the next step?

Tom