Aqui funcionou, mas o sistema não aplicou esse patch que mostra no seu log:
>>> Emerging (1 of 1) sys-apps/util-linux-2.19
* util-linux-2.19.tar.bz2 RMD160 SHA1 SHA256 size ;-) ... [ ok ]
* Package: sys-apps/util-linux-2.19
* Repository: gentoo
* Maintainer: base-system@gentoo.org
* USE: amd64 cramfs crypt elibc_glibc kernel_linux multilib nls perl slang unicode userland_GNU
* FEATURES: sandbox
>>> cfg-update-1.8.2-r1: Creating checksum index...
>>> Unpacking source...
>>> Unpacking util-linux-2.19.tar.bz2 to /var/tmp/portage/sys-apps/util-linux-2.19/work
>>> Source unpacked in /var/tmp/portage/sys-apps/util-linux-2.19/work
>>> Preparing source in /var/tmp/portage/sys-apps/util-linux-2.19/work/util-linux-2.19 ...
* Running elibtoolize in: util-linux-2.19/config/
* Applying portage-2.2.patch ...
* Applying sed-1.5.6.patch ...
* Applying as-needed-2.2.6.patch ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/sys-apps/util-linux-2.19/work/util-linux-2.19 ...
* econf: updating util-linux-2.19/config/config.guess with /usr/share/gnuconfig/config.guess
* econf: updating util-linux-2.19/config/config.sub with /usr/share/gnuconfig/config.sub
...
...--- replaced obj /bin/dmesg
--- replaced dir /bin
>>> Regenerating /etc/ld.so.cache...
>>> Original instance of package unmerged safely.
>>> Regenerating /etc/ld.so.cache...
>>> Auto-cleaning packages...
>>> No outdated packages were found on your system.
* GNU info directory index is up-to-date.
[]'s
Fernando Boaglio