PDO XAMPP 1.6.8a

Please:
i have XAMPP 1.6.8a and i need pdo_informix
but xampp not have pdo.h
please what i do
thanks
i have XAMPP 1.6.8a and i need pdo_informix
but xampp not have pdo.h
please what i do
thanks
https://community.apachefriends.org/f/
https://community.apachefriends.org/f/viewtopic.php?f=17&t=35167