localhost whisper # emerge -O portage && emerge portage
>>> Verifying ebuild Manifests...

>>> Emerging (1 of 1) sys-apps/portage-2.1.4.4 to /
 * portage-2.1.4.tar.bz2 RMD160 ;-) ...                                   [ ok ]
 * portage-2.1.4.tar.bz2 SHA1 ;-) ...                                     [ ok ]
 * portage-2.1.4.tar.bz2 SHA256 ;-) ...                                   [ ok ]
 * portage-2.1.4.tar.bz2 size ;-) ...                                     [ ok ]
 * portage-2.1.4.4.patch.bz2 RMD160 ;-) ...                               [ ok ]
 * portage-2.1.4.4.patch.bz2 SHA1 ;-) ...                                 [ ok ]
 * portage-2.1.4.4.patch.bz2 SHA256 ;-) ...                               [ ok ]
 * portage-2.1.4.4.patch.bz2 size ;-) ...                                 [ ok ]
 * checking ebuild checksums ;-) ...                                      [ ok ]
 * checking auxfile checksums ;-) ...                                     [ ok ]
 * checking miscfile checksums ;-) ...                                    [ ok ]
 * checking portage-2.1.4.tar.bz2 ;-) ...                                 [ ok ]
 * checking portage-2.1.4.4.patch.bz2 ;-) ...                             [ ok ]
>>> Unpacking source...
>>> Unpacking portage-2.1.4.tar.bz2 to /var/tmp/portage/sys-apps/portage-2.1.4.4/work
>>> Unpacking portage-2.1.4.4.patch.bz2 to /var/tmp/portage/sys-apps/portage-2.1.4.4/work
 * Applying portage-2.1.4.4.patch ...                                     [ ok ]
 * Setting portage.VERSION to 2.1.4.4 ...                                 [ ok ]
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/sys-apps/portage-2.1.4.4/work/portage-2.1.4 ...
xmlto xhtml  portage.docbook
make: xmlto: Command not found
make: *** [xhtml] Error 127
 *
 * ERROR: sys-apps/portage-2.1.4.4 failed.
 * Call stack:
 *   ebuild.sh, line 1648:   Called dyn_compile
 *   ebuild.sh, line 988:   Called qa_call 'src_compile'
 *   ebuild.sh, line 44:   Called src_compile
 *   portage-2.1.4.4.ebuild, line 96:   Called die
 *
 * failed to make docs
 * 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-apps/portage-2.1.4.4/temp/build.log'.
 *

 * Messages for package sys-apps/portage-2.1.4.4:

 *
 * ERROR: sys-apps/portage-2.1.4.4 failed.
 * Call stack:
 *   ebuild.sh, line 1648:   Called dyn_compile
 *   ebuild.sh, line 988:   Called qa_call 'src_compile'
 *   ebuild.sh, line 44:   Called src_compile
 *   portage-2.1.4.4.ebuild, line 96:   Called die
 *
 * failed to make docs
 * 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-apps/portage-2.1.4.4/temp/build.log'.