>>> Compiling source in /var/tmp/portage/sys-boot/grub-0.97-r3/work/grub-0.97 ...
 * econf: updating grub-0.97/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating grub-0.97/config.sub with /usr/share/gnuconfig/config.sub
./configure --prefix=/usr --host=x86-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --libdir=/lib --datadir=/usr/lib/grub --exec-prefix=/ --disable-auto-linux-mem-opt --build=x86-pc-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking build system type... x86-pc-linux-gnu
checking host system type... x86-pc-linux-gnu
configure: error: unsupported CPU type

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/sys-boot/grub-0.97-r3/work/grub-0.97/config.log

!!! ERROR: sys-boot/grub-0.97-r3 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  environment, line 3775:   Called src_compile
  grub-0.97-r3.ebuild, line 85:   Called econf '--libdir=/lib' '--datadir=/usr/lib/grub' '--exec-prefix=/' '--disable-auto-linux-mem-opt'
  ebuild.sh, line 577:   Called die

!!! econf failed
!!! 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-boot/grub-0.97-r3/temp/build.log'.