livecd linux # emerge vim
Calculating dependencies... done!

>>> Emerging (1 of 5) dev-util/ctags-5.5.4-r3 to /
 * ctags-5.5.4.tar.gz size ;-) ...                                                                                                                      [ ok ]
 * ctags-5.5.4.tar.gz RMD160 ;-) ...                                                                                                                    [ ok ]
 * ctags-5.5.4.tar.gz SHA256 ;-) ...                                                                                                                    [ ok ]
 * ctags-5.5.4.tar.gz MD5 ;-) ...                                                                                                                       [ ok ]
 * checking ebuild checksums ;-) ...                                                                                                                    [ ok ]
 * checking auxfile checksums ;-) ...                                                                                                                   [ ok ]
 * checking miscfile checksums ;-) ...                                                                                                                  [ ok ]
 * checking ctags-5.5.4.tar.gz ;-) ...                                                                                                                  [ ok ]
>>> Unpacking source...
>>> Unpacking ctags-5.5.4.tar.gz to /var/tmp/portage/ctags-5.5.4-r3/work
 * Applying ctags-5.5.4-ebuilds.patch ...                                                                                                               [ ok ]
 * Applying ctags-5.5.4-ruby-classes.patch ...                                                                                                          [ ok ]
 * Applying ctags-5.5.4-haskell.patch ...                                                                                                               [ ok ]
 * Applying ctags-5.5.4-objc.patch ...                                                                                                                  [ ok ]
 * Applying ctags-5.5.4-vim-c.patch ...                                                                                                                 [ ok ]
touch: setting times of `/var/tmp/portage/ctags-5.5.4-r3/.unpacked': Function not implemented

!!! ERROR: dev-util/ctags-5.5.4-r3 failed.
Call stack:
  ebuild.sh, line 1543:   Called dyn_unpack
  ebuild.sh, line 708:   Called die

!!! IO Failure -- Failed 'touch .unpacked' in /var/tmp/portage/ctags-5.5.4-r3
!!! If you need support, post the topmost build error, and the call stack if relevant.