{ lib, stdenv, fetchurl, pkgconfig, libpulseaudio, alsaLib, libcap
, CoreAudio, CoreServices, AudioUnit
, usePulseAudio }:

stdenv.mkDerivation rec {
  version = "1.2.0";
  name = "libao-${version}";
  src = fetchurl {
    url = "http://downloads.xiph.org/releases/ao/${name}.tar.gz";
    sha256 = "1bwwv1g9lchaq6qmhvj1pp3hnyqr64ydd4j38x94pmprs4d27b83";
  };

  outputs = [ "dev" "out" "doc" ];

  buildInputs =
    [ pkgconfig ] ++
    lib.optional stdenv.isLinux (if usePulseAudio then libpulseaudio else alsaLib) ++
    lib.optional stdenv.isLinux libcap ++
    lib.optionals stdenv.isDarwin [ CoreAudio CoreServices AudioUnit ];

  meta = {
    longDescription = ''
      Libao is Xiph.org's cross-platform audio library that allows
      programs to output audio using a simple API on a wide variety of
      platforms.
    '';
    homepage = http://xiph.org/ao/;
    license = stdenv.lib.licenses.gpl2;
    maintainers = with stdenv.lib.maintainers; [ fuuzetsu ];
    platforms = with stdenv.lib.platforms; unix;
  };
}