tried the your approach it worked but compile cpp applications fails. [Sanity Checks - fails]
i found my way arround it by installing cross32-gcc and adding CC=/usr/bin/i686-unknown-linux-gnu-gcc to the dmd.conf file I have added the procedure to Wiki4D http://www.prowiki.org/wiki4d/wiki.cgi?D__Tutorial/StartingWithD/ Compiler/DMD#ArchLinuxASaferSolutionD
