Graeme Bryan wrote:

>>Download the source for the version of PHP you're running(so things
>>have a
>>better chance of working) Expand it out somewhere(doesn't really matter
>>where), cd into the directory, and just run the ./configure command
>>you got
>>from the previous step.

No need to run the full configure. If you have exactly the same version
of PHP, just run:

./configure --with-interbase=shared,/path/to/interbase

It is quite enough to build interbase.so file and plug it in existing
PHP installation (following the step 4 and beyond of Nigel's instructions).

--
Milan Babuskov
http://www.flamerobin.org