[LinuxBIOS] etherboot with LinuxBIOS

Does anyone know how to build etherboot with a current version of gcc?
I am using gcc version 3.4.3 and binutils 2.15.
I've tried several etherboot versions up to 5.4.0.
I know etherboot 5.2.6 with gcc 3.2.2 works, but that's an old version of gcc.  Thanks.

Steve