The GNU package manager updated LDC to 1.7.0 which now provides
x86_64-linux, see https://www.gnu.org/software/guix/packages/L/.
Runtime dependencies and build are listed at
0.17.4 (bootstrap) and LLVM 3.8.1.
LDC 0.17.4 provides x86_64-linux, i686-linux, armhf-linux.
We aim to add D compilers for all supported architectures.
Note that GNU Guix can run on top of all Linux distributions
because it is self-contained. Guix includes all its dependencies
(except the kernel) and can be removed easily.