ocomodake groff # ebuild groff-1.19.2-r2.ebuild unpack
 * groff-1.19.2.tar.gz MD5 ;-) ...                                                                                   [ ok ]
 * groff-1.19.2.tar.gz RMD160 ;-) ...                                                                                [ ok ]
 * groff-1.19.2.tar.gz SHA1 ;-) ...                                                                                  [ ok ]
 * groff-1.19.2.tar.gz SHA256 ;-) ...                                                                                [ ok ]
 * groff-1.19.2.tar.gz size ;-) ...                                                                                  [ ok ]
 * checking ebuild checksums ;-) ...                                                                                 [ ok ]
 * checking auxfile checksums ;-) ...                                                                                [ ok ]
 * checking miscfile checksums ;-) ...                                                                               [ ok ]
 * checking groff-1.19.2.tar.gz ;-) ...                                                                              [ ok ]
>>> Checking groff-1.19.2.tar.gz's mtime...
>>> Not marked as unpacked; recreating WORKDIR...
>>> Unpacking source...
 * Japanese support patch found. (See bug #134377.)
>>> Unpacking groff-1.19.2.tar.gz to /var/tmp/portage/groff-1.19.2-r2/work

 * Cannot find $EPATCH_SOURCE!  Value for $EPATCH_SOURCE is:
 *
 *   /usr/local/portage/sys-apps/groff/files/groff-1.19.2-infoext.patch
 *   ( groff-1.19.2-infoext.patch )


!!! ERROR: sys-apps/groff-1.19.2-r2 failed.
Call stack:
  ebuild.sh, line 1546:   Called dyn_unpack
  ebuild.sh, line 708:   Called src_unpack
  groff-1.19.2-r2.ebuild, line 37:   Called epatch '/usr/local/portage/sys-apps/groff/files/groff-1.19.2-infoext.patch'
  eutils.eclass, line 198:   Called die

!!! Cannot find $EPATCH_SOURCE!
!!! If you need support, post the topmost build error, and the call stack if relevant.

!!! This ebuild is from an overlay: '/usr/local/portage'
docomodake groff #