cross-compiler DJGPP -> Linux: "C++ compiler not installed on this system"

[Michael Noisternig]

Hi,
after a long, tedious process I managed to build a cross-compiler for DOS/DJGPP with ELF (Linux) file 
format output.
Now compiling C files works fine but trying to compile C++ source code results in
"C++ compiler not installed on this system".

What files am I missing? Something went wrong with the installation?
(GCC is really stubborn for building on a DOS system.)

Thanks,
Michael Noisternig.