Because of the emacs dumper which makes all sorts of assumptions it really shouldn't, compiling emacs on Fedora generates a core dump when dumping.. error looks sort of like..

Dumping under names emacs and emacs-21.3.1
make[1]: *** [emacs] Segmentation fault (core dumped)

There's a very easy way to fix this:

setarch i386

and emacs will build just fine.