>>> Verifying ebuild Manifests...

>>> Emerging (1 of 1) cross-ia64-unknown-linux-gnu/glibc-2.5-r4 to /
 * glibc-libidn-2.5.tar.bz2 MD5 ;-) ...                                   [ ok ]
 * glibc-libidn-2.5.tar.bz2 RMD160 ;-) ...                                [ ok ]
 * glibc-libidn-2.5.tar.bz2 SHA1 ;-) ...                                  [ ok ]
 * glibc-libidn-2.5.tar.bz2 SHA256 ;-) ...                                [ ok ]
 * glibc-libidn-2.5.tar.bz2 size ;-) ...                                  [ ok ]
 * glibc-ports-2.5.tar.bz2 MD5 ;-) ...                                    [ ok ]
 * glibc-ports-2.5.tar.bz2 RMD160 ;-) ...                                 [ ok ]
 * glibc-ports-2.5.tar.bz2 SHA1 ;-) ...                                   [ ok ]
 * glibc-ports-2.5.tar.bz2 SHA256 ;-) ...                                 [ ok ]
 * glibc-ports-2.5.tar.bz2 size ;-) ...                                   [ ok ]
 * glibc-2.5.tar.bz2 MD5 ;-) ...                                          [ ok ]
 * glibc-2.5.tar.bz2 RMD160 ;-) ...                                       [ ok ]
 * glibc-2.5.tar.bz2 SHA1 ;-) ...                                         [ ok ]
 * glibc-2.5.tar.bz2 SHA256 ;-) ...                                       [ ok ]
 * glibc-2.5.tar.bz2 size ;-) ...                                         [ ok ]
 * glibc-linuxthreads-2.5.tar.bz2 MD5 ;-) ...                             [ ok ]
 * glibc-linuxthreads-2.5.tar.bz2 RMD160 ;-) ...                          [ ok ]
 * glibc-linuxthreads-2.5.tar.bz2 SHA1 ;-) ...                            [ ok ]
 * glibc-linuxthreads-2.5.tar.bz2 SHA256 ;-) ...                          [ ok ]
 * glibc-linuxthreads-2.5.tar.bz2 size ;-) ...                            [ ok ]
 * glibc-2.5-patches-1.8.tar.bz2 MD5 ;-) ...                              [ ok ]
 * glibc-2.5-patches-1.8.tar.bz2 RMD160 ;-) ...                           [ ok ]
 * glibc-2.5-patches-1.8.tar.bz2 SHA1 ;-) ...                             [ ok ]
 * glibc-2.5-patches-1.8.tar.bz2 SHA256 ;-) ...                           [ ok ]
 * glibc-2.5-patches-1.8.tar.bz2 size ;-) ...                             [ ok ]
 * checking ebuild checksums ;-) ...                                      [ ok ]
 * checking auxfile checksums ;-) ...                                     [ ok ]
 * checking miscfile checksums ;-) ...                                    [ ok ]
 * checking glibc-2.5.tar.bz2 ;-) ...                                     [ ok ]
 * checking glibc-ports-2.5.tar.bz2 ;-) ...                               [ ok ]
 * checking glibc-libidn-2.5.tar.bz2 ;-) ...                              [ ok ]
 * checking glibc-2.5-patches-1.8.tar.bz2 ;-) ...                         [ ok ]
 * checking glibc-linuxthreads-2.5.tar.bz2 ;-) ...                        [ ok ]
>>> Unpacking source...

 * Checking gcc for __thread support ...
  [ ok ]
 * Checking linux-headers version (>=2.6.9) ...
gcc-config error: Could not run/locate "ia64-unknown-linux-gnu-cpp"
  [ !! ]

 * You need linux-headers of at least version 2.6.9
 * for NPTL support!

!!! ERROR: cross-ia64-unknown-linux-gnu/glibc-2.5-r4 failed.
Call stack:
  ebuild.sh, line 1638:   Called dyn_unpack
  ebuild.sh, line 763:   Called qa_call 'src_unpack'
  ebuild.sh, line 44:   Called src_unpack
  glibc-2.5-r4.ebuild, line 1110:   Called toolchain-glibc_src_unpack
  glibc-2.5-r4.ebuild, line 169:   Called check_nptl_support
  glibc-2.5-r4.ebuild, line 786:   Called die

!!! linux-headers version too low!
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/cross/ia64-unknown-linux-gnu/portage/cross-ia64-unknown-linux-gnu/glibc-2.5-r4/temp/build.log'.

!!! This ebuild is from an overlay: '/usr/local/portage'