{ stdenv, fetchurl, pkgconfig
, libjpeg
, alsaLib ? null
, libX11 ? null
, qt4 ? null # The default is set to qt4 in all-packages.nix
, qt5 ? null
}:

# See libv4l in all-packages.nix for the libs only (overrides alsa, libX11 & QT)

assert qt4 != null -> qt5 == null;
assert qt5 != null -> qt4 == null;

let
  inherit (stdenv.lib) optional;
in

stdenv.mkDerivation rec {
  name = "v4l-utils-1.10.1";

  src = fetchurl {
    url = "http://linuxtv.org/downloads/v4l-utils/${name}.tar.bz2";
    sha256 = "1h1nhg5cmmzlbipak526nk4bm6d0yb217mll75f3rpg7kz1cqiv1";
  };

  outputs = [ "out" "dev" ];

  configureFlags = [
    "--enable-libv4l"
  ] ++ (if (alsaLib != null && libX11 != null && (qt4 != null || qt5 != null)) then [
    "--with-udevdir=\${out}/lib/udev"
    "--enable-v4l-utils"
    "--enable-qv4l2"
  ] else [
    "--without-libudev"
    "--without-udevdir"
    "--disable-v4l-utils"
    "--disable-qv4l2"
  ]);

  postFixup = ''
    # Create symlink for V4l1 compatibility
    ln -s "$dev/include/libv4l1-videodev.h" "$dev/include/videodev.h"
  '';

  nativeBuildInputs = [ pkgconfig ];

  buildInputs = [ alsaLib libX11 qt4 qt5 ];

  propagatedBuildInputs = [ libjpeg ];

  meta = with stdenv.lib; {
    description = "V4L utils and libv4l, provide common image formats regardless of the v4l device";
    homepage = http://linuxtv.org/projects.php;
    license = licenses.lgpl21Plus;
    maintainers = with maintainers; [ codyopel viric ];
    platforms = platforms.linux;
  };
}