In case you need to build some binaries for some kind of DOS based bootstrap process, don't look far, the repository home:fstrba:msdos has all you need. A gcc-4.3.4 based cross-compiler for C and C++ along with the CVS HEAD version of DJGPP headers and libraries. The resulting executables running under DOS need a DPMI implementation like this one in the same directory to run.
When/If I have time, I will try to extend it to different languages supported by gcc.
Taste it and enjoy how sweet it is.