[Gulli] gentoo: problema con emerge xorg-x11

[dado]

al termine di una lotta dura... ho il mio portatile con questi sistemi 
funzionanti: 
- opensuse 10.2
- slackware 12
- gentoo 2007 
per quest'ultima ho eseguito l'installazione partendo dal cd minimal e poi 
partendo dallo stage3 .. che fatica... ma sembra ne si valsa la pena ...
però adesso volevo anche metterci X e poi kde (o gnome ??)..

ecco cosa mi succede:

t40 ~ # emerge xorg-x11
Calculating dependencies -!!! Digest verification failed:
!!! /usr/portage/media-libs/fontconfig/fontconfig-2.3.2-r1.ebuild
!!! Reason: Filesize does not match recorded size
!!! Got: 2681
!!! Expected: 2687
!!! Digest verification failed:
!!! /usr/portage/media-libs/fontconfig/fontconfig-2.3.2-r1.ebuild
!!! Reason: Filesize does not match recorded size
!!! Got: 2681
!!! Expected: 2687

!!! All ebuilds that could satisfy "media-libs/fontconfig" have been masked.
!!! One of the following masked packages is required to complete your request:
!!! Digest verification failed:
!!! /usr/portage/media-libs/fontconfig/fontconfig-2.3.2-r1.ebuild
!!! Reason: Filesize does not match recorded size
!!! Got: 2681
!!! Expected: 2687
- media-libs/fontconfig-2.3.2-r1 (masked by: corruption)
!!! Digest verification failed:
!!! /usr/portage/media-libs/fontconfig/fontconfig-2.3.2-r1.ebuild
!!! Reason: Filesize does not match recorded size
!!! Got: 2681
!!! Expected: 2687
- media-libs/fontconfig-2.4.2 (masked by: corruption)

For more information, see MASKED PACKAGES section in the emerge man page or
refer to the Gentoo Handbook.
(dependency required by "media-fonts/ttf-bitstream-vera-1.10-r3" [ebuild])
------------------

ho provato un # emerge-websync ma mi dice che è tutto ok?

chiedo lumi ai guro di gentoo...