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We don't have or call noreturn functions in practice and it makes
the stun test build fail on clang.

clang on recent macOS seems to only emit a warning on unknown flags
which makes this test fail and then when using Werror, it makes the
compiler test fail too.

GLib already uses it, instead of adding another dep.
Reviewed-by: Philip Withnall <philip.withnall@collabora.co.uk>
Differential Revision: https://phabricator.freedesktop.org/D1705

They're not present int he 1.5.0 release, so require
the newer one.

This will shortly be used to implement secure random number generation.

Differential Revision: https://phabricator.freedesktop.org/D1609

As udp-bsd.ccode is using G_IO_ERROR_CONNECTION_CLOSED glib 2.44
is required.

Change-Id: I1bb63f2484c513c58eeec312ba0835164604c40c
Reviewed-by: Philip Withnall <philip@tecnocode.co.uk>
https://phabricator.freedesktop.org/T3492

This is needed for G_IO_ERROR_BROKEN_PIPE, which is used in the I/O
stream code.

Reported by Emanuele Bizzarri <emabiz76@gmail.com> on the mailing list.

Error introduced in 20ea22e0, resulting in a
configure/build error when building without gstreamer:

configure: error: conditional "HAVE_GST_CHECK" was never defined.
Usually this means the macro was only invoked conditionally.

https://bugs.freedesktop.org/show_bug.cgi?id=90801

https://bugs.freedesktop.org/show_bug.cgi?id=90010

https://bugs.freedesktop.org/show_bug.cgi?id=73042

https://bugs.freedesktop.org/show_bug.cgi?id=85962

https://bugs.freedesktop.org/show_bug.cgi?id=89609

Automake now warns that it will be the only behavior
in the future. So quell the warning by adding it.

Templated mode has been deprecated for a long time and will be removed
in future versions of gtk-doc. Switch to no-tmpl mode for faster
documentation builds and future-proofness.

This does not bump our gtk-doc dependency, since gtk-doc 1.9 supported
no-tmpl mode.

Note that this only works for 1.0 plugin.

https://bugs.freedesktop.org/show_bug.cgi?id=85929

Clean up the UPnP mappings of each stream when closing it

This way all the debug can be controlled from one place.

Also disable -Wsuggest-attribute=format with -Werror because gcc 4.8.3
erroneously suggested it.

Rather than assuming it is not available on Windows.

This bumps our autoconf requirement to 2.62 (from 2.59c) and disables
automake portability warnings.

It does not introduce a hard dependency on gobject-introspection; but if
available, it requires version 1.30.0. Support can be enabled with
--enable-introspection, and is required to make distcheck.

The generated introspection file has not been checked thoroughly, and
may expose internal symbols. A lot of new annotations are needed to make
many of the symbols usable.

It might be useful for dependent packages to check whether libnice was
compiled with UPnP support, so expose that as a variable in the
pkg-config file, set to ‘true’ if supported, and the empty string
otherwise.

The requirements in the pkg-config file were outdated and incomplete. It
makes a lot more sense to automatically substitute them in from the
checks in configure.ac.

We use macros from 1.12 anyway.