Hello,
Some links are broken on this page: http://gcc.gnu.org/install/specific.html
Specifically: i?86-*-sco3.2v5* i?86-*-solaris2.10 x86_64-*-*, amd64-*-* all ELF targets
See also previous discussion on a similar issue: http://gcc.gnu.org/ml/gcc/2005-04/msg00477.html
Regards, Dimitri Papadopoulos