[CentOS] Building QT on CentOS 5

I am building QT 4.8.6 on CentOS 5 and it is failing on building
the webkit module with __sync_add_and_fetch_4 not being defined.
My build is for Embedded Linux, which allows me to use the framebuffer.

Posts report this error when trying to cross-compile for ARM,
but I am building for X86.   Several posts also indicate that this
is due to the old GCC used by CentOS 5.

Does anyone have any suggestions?

Thanks,
--
Wade Hampton