During the final v1.11.0 release tests I found that both gcc v3.4 and gcc v4.4 (at least as shipped with Fedora 13) will no longer successfully compile SeaBIOS. The two different gcc versions failed on two different errors.
Instead of trying to keep the code compatible with these old compilers I went forward with the release as is. I don't think there is a compelling reason to continue to support these old versions of gcc.
The gcc v4.6.0 (at least as shipped on Fedora 15) continues to build SeaBIOS successfully.