stage 0: libtool and file pkg not built

hello everybody,

I made my first try with T2.
I'm working with Xubuntu 8.04 and downloaded t2-7.0-rc2 and started building a 
live CD for a "minimal desktop".

At stage 0 the packages "libtool" and "file" refuses to build:

from 0-file.err:
checking for i686-nocross-linux-gnu-g++... CXX_not_available_in_stage_0
checking whether we are using the GNU C++ compiler... no
checking whether CXX_not_available_in_stage_0 accepts -g... no
checking dependency style of CXX_not_available_in_stage_0... none
checking how to run the C++ preprocessor... /lib/cpp
configure: error: C++ preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details.
Due to previous errors, no 0-file.log file!

from 0-libtool.err:
checking how to run the C++ preprocessor... /lib/cpp
configure: error: C++ preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details.
Due to previous errors, no 0-libtool.log file!

Can somebody provide help ?

Thanks

Gerd
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