http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50653
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-10-07 09:26:01 UTC --- The archive is fine: tar tzf gcc-g++-4.6.1.tar.gz | grep '\.hp$' Either your download is corrupt (check its MD5 sum) or you need to use GNU tar to extract it.