[CentOS] problem with adding firebird/interbase support to PHP5

Hi,
I'm using CentOS since 4.2 on my server. Now, I need to add support for 
firebird to PHP. I've installed PHP5 from Centos-contrib or Centos-plus. The 
firebird2 was installed from sources (./configure && make && make install). I 
tried to add "--with-interbase=shared,/usr/local/firebird" to php.spec but it 
doesn't work :(. Can you please help me howto add support for firebird to 
PHP ?

-- 
S pozdravom / Best regards
	Tomas Srnka
	mobil: ++421 910 198 432
	e-mail: toms at linuxos.sk
	ICQ#: 458-128-722
	Skype: tomas_srnka