Note: DMD only works on 32bit systems. 64bit isn't supported yet.

For the D2 compiler:

svn co http://svn.dsource.org/projects/dmd/trunk dmd-2.x
cd dmd-2.x/src
ln -s . mars
make -f linux.mak

For the D1 compiler

svn co http://svn.dsource.org/projects/dmd/branches/dmd-1.x
cd dmd-1.x/src
ln -s . mars
make -f linux.mak