newbie: my extension not getting compiled/included in Php-5.3.1 (RH linux)

I am new to Php-dev and trying to add an extension to Php I downloaded php-5.3.1 src on RedHatLinux4 . After adding my extension, the configure/make doesn't build my extension and include in Php. commands that I ran after unzipping the php5.3.1 src: cd ext ./ext_skel --extname=pdo-mydbext <enabled in pdo-mydbext/config.m4> cd .. ./buildconf --force ./configure --enable-pdo-mydbext make My issue: No objects are compiled for my pdo-mydbext. In fact, seeing the output of ./configure on screen, I can see that my ext didn't called in extensions list. < .". whether to enable pdo-myext ..."> didn't get displayed by ./configure & make didn't build myext. What do I need to add my extension(to be compiled, and so on..) thanks, -sanjeev