Forum OpenACS Q&A: Re: Compiling Aolserver on x86_64
At least I think it is :)
Anyway, I compiled Tcl 8.4.11 on this system as well. Its FC4 2.6.12 kernel compiled fir i686, in this case. If fact its cvs.openacs.org and I can't install the cvs browser until I get it fixed.