This is the version in Debian Stretch (stable).

This is the version in Debian Jessie (oldstable), a reasonable "old
enough" version to keep support for.

`$srcdir/.git` doesn't exist if `$srcdir` is a worktree.

This was missing in commit 8266ab55 for #69.

This is the version in Debian Jessie (oldstable).

This typo was present since the option was added in commit ed001e0c

Migrating from DocBook to Sphinx.  Editing XML is really too
cumbersome.

To get udisks2 support started, this commit contains the configure.ac
option and a "neighbor" plugin which shows block devices.  Later, this
will allow mounting removable media with a new storage plugin.

From https://github.com/CM4all/libcommon/commit/a7cef404c1f7eedff1a629da48f77491218ee281

To be used by upcoming code.

Closes #256

lockfree library used by ALSA output plugin is part of Boost from version 1.53,
so this can be theoretically the lowest required version, however
there are issues which are resolved from 1.54 onwards.

Allow using libyajl in other parts of MPD.

This fixes a build issue on Haiku as it does have sin_len.
Tested on Linux as well.

For some reason AC_CHECK_MEMBER doesn't generate the proper define
in config.h.in, so I used AC_CHECK_MEMBERS.