Hello,
That's is what I concluded. I have successfully set up and ran a 'info.php' file using the 'phpinfo()' function as you described which is what told me that the SQLite PDO driver was already present but no other PDO driver. I have the full LAMP stack implemented on the i386 NuTyX PC minus the missing PDO driver.
I have been actively building LFS/BLFS for some time. I have an LFS 8.4 i386 PC with the full LAMP stack including Php with the PDO drivers for MySQL and SQLite. I am thinking that all I would need to do is transplant the shared library (.so) from the LFS PC to my NuTyX PC and modify the php.ini (along with running 'ldconfig'). If that does not work, I can compile Php from scratch on the NuTyX PC using the LFS/BLFS procedure. The only complicating factor is that the basic NuTyX distribution does not include the compiler or 'make', 'wget' and 'tar'.
I opened a Github i686 issue regarding this.
Thanks for your advice and for listening,
Rick