I must apologize, because this is likely offtopic in this forum. I have tried tracking down the layman overlay maintainer for "mpd", alas to no avail.
Cut right to the chase: the "ncmpcpp-9999" ebuild in the "mpd" overlay [gentoo, funtoo] is broken and has been for at least 6 months now. It invariably fails on attempting to install the documentation, and ends up bailing out before installing anything including the successfully compiled executable. [cf. line 64 of the ebuild "dodoc AUTHORS NEWS doc/config doc/keys"]. As there is no "doc/keys" file in the git-sources.
Fix is to drop the "doc/keys" from said line or to compile from git-sources per hand. Hope this helps somebody.