Don't quote me, but the only way distributions can ship DMD is via a script that does a download from dlang.org, extract, install process(like eg: flashplayer).
Unless I'm misunderstanding how the arch repositories work, Dicebot has the Arch dmd package setup with dmd hosted on the arch servers/mirrors. I presume this is with Walter's permission.
https://www.archlinux.org/packages/community/x86_64/dmd/
