Have tried to get this to run with soxr since it was introduced without success:
terminate called after throwing an instance of 'std::runtime_error'
Jan 22 07:43 : fatal_error: MPD died from signal 6
10.3-STABLE FreeBSD 10.3-STABLE #0 r302196 amd64
This is unrelated to soxr. I get the same thing here. I don't even have libsoxr installed and I get the exact same thing here.
(In reply to Zane C. Bowers-Hadley from comment #1)
Found the same thing yesterday trying to build it with a variety of options.
This happens with default options as well? On 10.3/amd64?
Yes, after an rmconfig and accepting the defaults, same error on start.
I am seeing this on 10-STABLE/amd64.
FreeBSD vixen42.vulpes.vvelox.net 10.3-STABLE FreeBSD 10.3-STABLE #1 r312433: Thu Jan 19 16:02:53 CST 2017 firstname.lastname@example.org:/usr/obj/arc/src/FreeBSD/base/stable/10/sys/GENERIC amd64
Also did a rmconfig-recursive and rebuild everything via portupgrade -R musicpd and it still failed.
Noticed 215826 today. Just rebuilt and installed libexec/rtld-el and am seeing if that affects it.
Rebuilding everything, world included, did not solve it.
I can reproduce the problem here. Will look into it as soon as I can. Until then, patches are very welcome :-)
A commit references this bug:
Date: Sat Jan 28 14:28:50 UTC 2017
New revision: 432625
Update to upstream version 0.20.3; fixes see below
- Update to upstream version 0.20.3
- Resolve c++ stdlib overlinking on FreeBSD-10, fixes 
- Promote HTTPD to default OPTION (proposal by email@example.com)
- Update REINPLACEs on example config file to match upstream changes
- Add additional hint on directory permissions and ownership for
initial mpd service start in pkg-message.in
- Pet portlint
Reported by: firstname.lastname@example.org