>>> Unpacking source...
>>> Unpacking portage-2.1.3.tar.bz2 to /var/tmp/portage/sys-apps/portage-2.1.3.9/work
>>> Unpacking portage-2.1.3.9.patch.bz2 to /var/tmp/portage/sys-apps/portage-2.1.3.9/work
 * Applying portage-2.1.3.9.patch ...                                                         [ ok ]
 * Setting portage.VERSION to 2.1.3.9 ...                                                     [ ok ]
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/sys-apps/portage-2.1.3.9/work/portage-2.1.3 ...
tbz2tool.c:1: error: bad value (athlon64-O3) for -march= switch
tbz2tool.c:1: error: bad value (athlon64-O3) for -mtune= switch

!!! ERROR: sys-apps/portage-2.1.3.9 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  environment, line 3395:   Called src_compile
  portage-2.1.3.9.ebuild, line 92:   Called die

!!! Failed to build tbz2tool
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/sys-apps/portage-2.1.3.9/temp/build.log'.

(chroot) livecd / #