make installworld failure (mklocale)

I installed BETA1, then csup HEAD on 07/13, upgraded the system 
correctly (buildworld + buildkernel, installkernel + installworld).

This morning I'm trying to upgrade again, but installworld fails with:

-----------------------------------------------------------
===> share/mklocale (install)
install -o root  -g wheel -m 444  UTF-8.out 
/usr/share/locale/UTF-8/LC_CTYPE
mklocale -o am_ET.UTF-8.out /usr/src/share/mklocale/am_ET.UTF-8.src
mklocale:No such file or directory
*** Error code 1

Stop in /usr/src/share/mklocale.
*** Error code 1

Stop in /usr/src/share.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
-------------------------------------------------------------

Any workaround?

Angelo