I'm using debian testing and there is a gdc in the repositorys but it's only compiling d1.
I followed the exact instructions to compile my own version and failed. I'm going to try again and post the results.

2011/9/14 Anders F Björklund <afb@algonet.se>
maarten van damme wrote:
is there somewhere an up-to-date repo with gdc in compiling d2? the
precompiled ones I tried were all for d1 and the one I tried to compile
failed with "your c compiler isn't capable of compiling"

I'm not doing any more precompiled/binary installers. Check your distro?
But for MinGW, I'm now instead using http://mingw-w64.sourceforge.net/

--anders