Buildroot / sudo : fails sanity check?

[Paugam Luc]

Hi All,

I just downloaded today the snapshot of buildroot and try to compile it
as is without modifying the default configuration.
Everything compile fine except when configuring sudo-1.6.8p9 package ; I
got the following error:
[ ... ]
checking for i686-linux-g++...
/mnt/hda3/buildroot/20060524/buildroot/build_i686/staging_dir/bin/i686-l
inux-uclibc-g++
checking whether we are using the GNU C++ compiler... no
checking whether
/mnt/hda3/buildroot/20060524/buildroot/build_i686/staging_dir/bin/i686-l
inux-uclibc-g++ accepts -g... no
checking how to run the C++ preprocessor... /lib/cpp
configure: error: C++ preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details.
make: ***
[/mnt/hda3/buildroot/20060524/buildroot/build_i686/sudo-1.6.8p9/.configu
red] Error 1

Do you know which mistake I did?
Or is it an already known issue?

PS: I used a derivative version of KNOPPIX distro, called
KernelKit-0.4.4

Many thanks for your collaboration.

Regards - Luc