localhost david # emerge sabayon-version
Calculating dependencies... done!
>>> Verifying ebuild Manifests...

>>> Emerging (1 of 1) app-misc/sabayon-version-3.4-r1 to /
 * checking ebuild checksums ;-) ...                                                                                  [ ok ]
 * checking auxfile checksums ;-) ...                                                                                 [ ok ]
 * checking miscfile checksums ;-) ...                                                                                [ ok ]
>>> Unpacking source...
 *
 * ERROR: app-misc/sabayon-version-3.4-r1 failed.
 * Call stack:
 *   ebuild.sh, line 1647:   Called dyn_unpack
 *   ebuild.sh, line 768:   Called qa_call 'src_unpack'
 *   ebuild.sh, line 44:   Called src_unpack
 *   sabayon-version-3.4-r1.ebuild, line 34:   Called die
 *
 * No release type selected using USE flags
 * 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-misc/sabayon-version-3.4-r1/temp/build.log'.