PHP and MSSQL

Dear list, my system is running an apache webserver (1.3.19) and php (4.0.6). I tried to connect (through php) to a MSSQL Database. This didn't work. I found out, that I have to compile PHP with SYSBASE support. Why did suse not include the mssql support through sybase. Is it security related? Can I easily add this feature or do I have to fear a big security leak. Greets Robert