compiling from t2-trunk will find not modprobe

Compiling t2 ( checked out t2-trunk by svn + an extra svn up) fails 
another time on ubuntu 6.10 w/ the following error:
--
cp: cannot stat 
`/var/tmp/t2-project/t2-trunk/build/system-7.0-trunk-generic-x86-pentium-mmx/sbin/modprobe': 
No such file or directory
Due to previous errors, no 1-linux26.log file!
(Try enabling xtrace in the config to track an error inside the build 
system.)
--

There is no modprobe utility build.
What me also puzzles is that xtrace is enabled when doing the config.

Any help is appreciated.
--
Volker Jahns, volker@xxxxxxxxxxx