PHP vs. FreeTDS

Hi! I am installing the FreeTDS so that unix machine can use PHP to connect to MS-SQL Server using odbc_connect. However, the direction is pretty tricky and it isn't much of a help in clarification. I have been wonder if I am suppose to use the sybase environment variable and library path. From what I understand is that I don't need to use those because it is for SYBASE only. All I can do is to compile FreeTDS with the "./config --with-sybase=../freetds-0.51" and it would take care of that for PHP use. Am I wrong? Please help me out! Thanks, Scott