* checking genpatches-2.6.18-1.extras.tar.bz2 ;-) ...                                                           [ ok ]>>> Checking linux-2.6.18.tar.bz2's mtime...
>>> Checking genpatches-2.6.18-1.base.tar.bz2's mtime...
>>> Checking genpatches-2.6.18-1.extras.tar.bz2's mtime...
>>> Not marked as unpacked; recreating WORKDIR...
rm: cannot remove `/var/tmp/portage/gentoo-sources-2.6.18/work/linux-2.6.18': Function not implemented
rm: cannot remove `/var/tmp/portage/gentoo-sources-2.6.18/work/linux-2.6.18-gentoo': Function not implemented
rm: cannot remove `/var/tmp/portage/gentoo-sources-2.6.18/work/patches': Function not implemented
>>> Unpacking source...
>>> Unpacking linux-2.6.18.tar.bz2 to /var/tmp/portage/gentoo-sources-2.6.18/work
chmod: cannot access `./linux-2.6.18': Function not implemented
chmod: cannot access `./linux-2.6.18-gentoo': Function not implemented
chmod: cannot access `./patches': Function not implemented
mv: cannot move `linux-2.6.18' to `linux-2.6.18-gentoo/linux-2.6.18': Directory not empty

!!! ERROR: sys-kernel/gentoo-sources-2.6.18 failed.
Call stack:
  ebuild.sh, line 1546:   Called dyn_unpack
  ebuild.sh, line 708:   Called src_unpack
  ebuild.sh, line 1255:   Called kernel-2_src_unpack
  kernel-2.eclass, line 978:   Called universal_unpack
  kernel-2.eclass, line 385:   Called die

!!! Unable to move source tree to 2.6.18-gentoo.
!!! If you need support, post the topmost build error, and the call stack if relevant.