Look for symbol "mpc_demux_init" which does not exist in SV7.  This
avoids build failures when SV7 was found by configure.ac.

A file called ".jpg" is not a JPEG file with an empty name; it is
merely a hidden file.

If we have libyajl 2.0.1 (without a pkg-config file), our configure.ac
would assume this is the libyajl 1.0 API, because the function
yajl_alloc() exists in both.  This commit changes the library check to
the function yajl_parse_complete() which was removed in the 2.0 API.
This fixes build failure with libyajl 2.0.1.

We can assume that initgroups() would be a no-op in that case, however
initgroups() is not allowed for unprivileged users anyway.

The "mode" of the second ReplayGainFilter was never set, and thus
replay gain was never applied to the new song during cross-fade.

For std::move().

Some tagging libraries (eg. TagLib) produce that variant.

Broken by commit 3b0fea5f

This deadlock was a regression by commit 8e38b4f8.  Since we currently
can't resolve this, let's revert the commit, and add a GLib specific
workaround for the build failure.

File generated by automake version 1.14.

This is safer, and works without epoll().  Fixes a build failure with
uClibc, which does not support epoll().

The real and detailed documentation is in the user manual.

Move from doc/mpd.conf.5.

Move from doc/mpd.conf.5.

If the file was recognized by a decoder plugin, accept it - don't
require metadata.

On OSX, the configure-flag --enable-osx is used to enable the
unsupported osx output. It sets the HAVE_OSX preprocessor define.

src/output/OpenALOutputPlugin.cxx uses this define to determine wether
it is building on OSX, and imports different headers (which have
nothing to do with the osx output) depending on wether or not it is
set.