configure: error:
*** These critical programs are missing or too old: gcc
*** Check the INSTALL file for required versions.

!!! ERROR: sys-libs/glibc-2.5 failed.
Call stack:
  ebuild.sh, line 1613:   Called dyn_compile
  ebuild.sh, line 970:   Called qa_call 'src_compile'
  environment, line 4075:   Called src_compile
  glibc-2.5.ebuild, line 1119:   Called toolchain-glibc_src_compile
  glibc-2.5.ebuild, line 233:   Called glibc_do_configure 'linuxthreads'
  glibc-2.5.ebuild, line 891:   Called die

!!! failed to configure glibc
!!! 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-libs/glibc-2.5/temp/build.log'.