Cannot check "C++" in additional language

[Alexandre]

Hi everyone,

I'm using crosstool-ng v 1.21.0
Following this tutorial : http://www.kitware.com/blog/home/post/426 I 
managed to compile a helloworld code written in C and have it work on my 
rapsberry pi. This worked great.
However my real interest is in C++. I wanted to apply the same procedure 
for C++, but menuconfig does not allow me to check the C Compiler -> C++ 
case! When I press select, nothing happens.
Could anyone tell me how to be a able to work on C++ codes with 
crosstool-ng?

Thanks in advance,

Alex

Additional info:
Ubuntu 12.04 LTS
gcc version : 4.6.3
crosstool-ng v1.21.0



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