app-office/libreoffice-3.6.6.2 is masked apparently without a good reason:

1. emerge -p =app-office/libreoffice-3.6.6.2

These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild U #] app-office/libreoffice-3.6.6.2 [3.6.4.3] USE="branding cups dbus gstreamer java kde opengl vba webdav (-aqua) -binfilter -binfilterdebug -eds -gnome -gtk -jemalloc -mysql -odk -postgres {-test}" LIBREOFFICE_EXTENSIONS="pdfimport presenter-console presenter-minimizer -nlpsolver -scripting-beanshell -scripting-javascript -wiki-publisher" PYTHON_SINGLE_TARGET="python2_7%* -python2_5% -python2_6%" PYTHON_TARGETS="python2_7%* -python2_5% -python2_6%" 106,945 kB

Total: 1 package (1 upgrade), Size of downloads: 106,945 kB

The following mask changes are necessary to proceed:
(see "package.unmask" in the portage(5) man page for more details)
#required by =app-office/libreoffice-3.6.6.2 (argument)

1. /mnt/2T/portage/profiles/funtoo/1.0/linux-gnu/build/stable/package.mask/funtoo:
2. Ryan Harris <rh1@funtoo.org> (3 Jun 2012)
3. >=libreoffice-3.5.4.2 needs >=gcc-4.5
   =app-office/libreoffice-3.6.6.2

NOTE: The --autounmask-keep-masks option will prevent emerge
from creating package.unmask or ** keyword changes.

angry_vincent suggested to file a bug report so here it goes...