Last time I asked (28 feb 2008) I get this answer:
"Hello,
It appears to be an issue that the libmysqlclient libraries do not work on your system because it's a 64-bit version of debian, thus php won't compile. If you can, please install a 32-bit version of debian (you should not have /usr/lib64 if it's a 32-bit version). Debian 64-bit is not one of our supported OSs.
Thank you,
John"
Patje