$ uname -a
Linux gentoovm1 2.6.19-gentoo-r5 #1 SMP Wed Apr 4 05:44:43 UTC 2007 i686 Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz GenuineIntel GNU/Linux
$ emerge linux-headers -vp
These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild R ] sys-kernel/linux-headers-2.6.17-r2 USE="-gcc64" 40,347 kB
Total: 1 package (1 reinstall), Size of downloads: 40,347 kB
$ emerge gentoo-sources