Na minha empresa, estou usando o Windows 8, IBM Informix Dynamic Server, XAMPP v3.2.1, IBM Informix Client SDK 4.10 (64 bits).
Eu tentei baixar php_pdo_informix.dll, php_pdo.dll, tudo que eu tenho foi:
PHP Warning: PHP Startup: PDO: Unable to initialize module Module compiled with module API=20050922 PHP compiled with module API=20100525 These options need to match
PHP Startup: Unable to load dynamic library "C:\xampp\php\ext\php_pdo_informix.dll" - %1 is not a valid Win32 application.
Então baixei o PDO_INFORMIX-1.3.1.tgz e tentei compilá-lo com:
buildconf --force
configure --enable-aop
nmake
o resultado foi:
'buildconf' is not recognized as an internal or external command,
operable program or batch file.