h36sa@bowser ~ $ sudo emerge -va xen xen-sources xen-tools

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild   R   ] app-emulation/xen-3.0.2  USE="-custom-cflags -debug -hardened% -pae" 0 kB
[ebuild  N    ] sys-kernel/xen-sources-2.6.16.28-r2  USE="-build -symlink" 40,293 kB
[ebuild   R   ] app-emulation/xen-tools-3.0.2-r4  USE="sdl -custom-cflags -debug -doc -pygrub -screen -vnc" 0 kB

Total: 3 packages (1 new, 2 reinstalls), Size of downloads: 40,293 kB

Would you like to merge these packages? [Yes/No] y
>>> Verifying ebuild Manifests...
>>> starting parallel fetching

>>> Emerging (1 of 3) app-emulation/xen-3.0.2 to /
 * xen-3.0.2-src.tgz RMD160 ;-) ...                                       [ ok ]
 * xen-3.0.2-src.tgz SHA1 ;-) ...                                         [ ok ]
 * xen-3.0.2-src.tgz SHA256 ;-) ...                                       [ ok ]
 * xen-3.0.2-src.tgz size ;-) ...                                         [ ok ]
 * checking ebuild checksums ;-) ...                                      [ ok ]
 * checking auxfile checksums ;-) ...                                     [ ok ]
 * checking miscfile checksums ;-) ...                                    [ ok ]
 * checking xen-3.0.2-src.tgz ;-) ...                                     [ ok ]
>>> Unpacking source...
>>> Unpacking xen-3.0.2-src.tgz to /var/tmp/portage/app-emulation/xen-3.0.2/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/app-emulation/xen-3.0.2/work/xen-3.0.2 ...
 __  __            _____  ___   ____
 \ \/ /___ _ __   |___ / / _ \ |___ \
  \  // _ \ '_ \    |_ \| | | |  __) |
  /  \  __/ | | |  ___) | |_| | / __/
 /_/\_\___|_| |_| |____(_)___(_)_____|

nm: /var/tmp/portage/app-emulation/xen-3.0.2/work/xen-3.0.2/xen/xen-syms: no symbols
No valid symbol.
make[1]: *** [/var/tmp/portage/app-emulation/xen-3.0.2/work/xen-3.0.2/xen/xen-syms] Error 1
make: *** [/var/tmp/portage/app-emulation/xen-3.0.2/work/xen-3.0.2/xen/xen] Error 2

!!! ERROR: app-emulation/xen-3.0.2 failed.
Call stack:
  ebuild.sh, line 1614:   Called dyn_compile
  ebuild.sh, line 971:   Called qa_call 'src_compile'
  ebuild.sh, line 44:   Called src_compile
  xen-3.0.2.ebuild, line 73:   Called die

!!! compile 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/app-emulation/xen-3.0.2/temp/build.log'.

h36sa@bowser ~ $