try
--with-interbase=shared,/usr/local/firebird

shared is for use interbase like a module, you can delete it.
The path is where you have installed firebird

Download the last firebird (1.5 RC4)

Good luck

--- In firebird-php@yahoogroups.com, "lentje2003" <wouter@t...> wrote:
> Hello,
>
> Im trying to compile firebird 1.5 with php 4.3.2 for a few days
now.
> It just wont work. I fixed some errors but still it doesnt work.
>
> When i try to compile PHP with Firebird with:
>
> ./configure \
> --with-mysql \
> --with-apache=/usr/local/apache \
> --with-zlib-dir=/usr/local/zlib-1.1.4 \
> --with-interbase
>
> I get this error:
> configure: error: libgds or libib_util not found! Check config.log
> for more information.
>
> Facts:
> - Running debian 3 with 2.2.20-compact kernel
> - Trying to compile PHP 4.3.2
> - Using Firebird 1.5 RC3 classic
>
> I searched for libgds in the apt packages and found one
(libfirebird-
> c32/64, something like that). Installed it, but still wont work.
>
> Anyone got the fix, or knows what to do?
>
> Greets,
> Wouter van Lent