I am using UniServer Zero XI 11.00 with default included PHP 5.4 on Windows 7 32-bits I replaced MySQL with ZeroXI_mariadb_10_0_4.exe I added the following to php_production.ini : extension=php_pdo_pgsql.dll When I start Apache, then I receive the following error : httpd_z.exe - System Error The program can't start because libintl.dll is missing from your computer. Try reinstalling the program to fix this problem.