Bug 137249 describes an integer overflow in the GD image library. PHP
can either use its internal GD, or the system GD library. In RHEL3,
we use the internal GD library.
We should use the system GD library rather than the internal PHP library.
This will probably also affect FC3.
Per bug 137249, the libgd embeded in PHP is modified to be safe
against this kind of issue.