>>> Emerging (1 of 1) app-misc/screen-4.0.2-r5 to /
 * screen-4.0.2.tar.gz MD5 ;-) ...                                                                                                          [ ok ]
 * screen-4.0.2.tar.gz RMD160 ;-) ...                                                                                                       [ ok ]
 * screen-4.0.2.tar.gz SHA1 ;-) ...                                                                                                         [ ok ]
 * screen-4.0.2.tar.gz SHA256 ;-) ...                                                                                                       [ ok ]
 * screen-4.0.2.tar.gz size ;-) ...                                                                                                         [ ok ]
 * checking ebuild checksums ;-) ...                                                                                                        [ ok ]
 * checking auxfile checksums ;-) ...                                                                                                       [ ok ]
 * checking miscfile checksums ;-) ...                                                                                                      [ ok ]
 * checking screen-4.0.2.tar.gz ;-) ...                                                                                                     [ ok ]
>>> Unpacking source...
>>> Unpacking screen-4.0.2.tar.gz to /var/tmp/portage/screen-4.0.2-r5/work
 * Applying screen-4.0.1-int-overflow-fix.patch ...                                                                                         [ ok ]
 * Applying screen-4.0.1-vsprintf.patch ...                                                                                                 [ ok ]
 * Applying 4.0.2-no-utempter.patch ...                                                                                                     [ ok ]
 * Applying 4.0.2-no-libelf.patch ...                                                                                                       [ ok ]
 * Applying 4.0.2-64bit-time.patch ...                                                                                                      [ ok ]
 * Applying 4.0.2-windowlist-multiuser-fix.patch ...                                                                                        [ ok ]
 * Applying 4.0.2-nonblock.patch ...                                                                                                        [ ok ]
 * Running autoconf ...                                                                                                                     [ ok ]
touch: setting times of `/var/tmp/portage/screen-4.0.2-r5/.unpacked': Function not implemented

!!! ERROR: app-misc/screen-4.0.2-r5 failed.
Call stack:
  ebuild.sh, line 1546:   Called dyn_unpack
  ebuild.sh, line 709:   Called die

!!! IO Failure -- Failed 'touch .unpacked' in /var/tmp/portage/screen-4.0.2-r5
!!! If you need support, post the topmost build error, and the call stack if relevant.