Apparently Void seems to be stuck with GCC 4.9.3 (there's no official package for GCC 5.x). Rebuilding DLS with libstdc++ statically linked might help, but, unfortunately, I cannot comment on how long that'll take. I'll inform you once I find some time to work on it.
Sorry for the inconvenience. And thank you for your interest in DLS.
According this thread (https://forum.voidlinux.eu/t/why-is-void-still-using-gcc-4-9-3/420) you might be able to build GCC 5.2 from sources, in case you want to give it a try.