{ config, stdenv, fetchurl
, libX11, wxGTK
, libiconv, fontconfig, freetype
, libGLU_combined
, libass, fftw, ffms
, ffmpeg, pkgconfig, zlib # Undocumented (?) dependencies
, icu, boost, intltool # New dependencies
, spellcheckSupport ? true, hunspell ? null
, automationSupport ? true, lua ? null
, openalSupport ? false, openal ? null
, alsaSupport ? stdenv.isLinux, alsaLib ? null
, pulseaudioSupport ? config.pulseaudio or stdenv.isLinux, libpulseaudio ? null
, portaudioSupport ? false, portaudio ? null }:

assert spellcheckSupport -> (hunspell != null);
assert automationSupport -> (lua != null);
assert openalSupport -> (openal != null);
assert alsaSupport -> (alsaLib != null);
assert pulseaudioSupport -> (libpulseaudio != null);
assert portaudioSupport -> (portaudio != null);

with stdenv.lib;
stdenv.mkDerivation rec {
  pname = "aegisub";
  version = "3.2.2";

  src = fetchurl {
    url = "http://ftp.aegisub.org/pub/releases/${pname}-${version}.tar.xz";
    sha256 = "11b83qazc8h0iidyj1rprnnjdivj1lpphvpa08y53n42bfa36pn5";
  };

  # Fixup build with icu-59
  postPatch = "sed '1i#include <unicode/unistr.h>' -i src/utils.cpp";

  buildInputs = with stdenv.lib;
  [ pkgconfig intltool libX11 wxGTK fontconfig freetype libGLU_combined
    libass fftw ffms ffmpeg zlib icu boost boost.out libiconv
  ]
    ++ optional spellcheckSupport hunspell
    ++ optional automationSupport lua
    ++ optional openalSupport openal
    ++ optional alsaSupport alsaLib
    ++ optional pulseaudioSupport libpulseaudio
    ++ optional portaudioSupport portaudio
    ;

  enableParallelBuilding = true;

  hardeningDisable = [ "bindnow" "relro" ];

  # compat with icu61+ https://github.com/unicode-org/icu/blob/release-64-2/icu4c/readme.html#L554
  CXXFLAGS = [ "-DU_USING_ICU_NAMESPACE=1" ];

  # this is fixed upstream though not yet in an officially released version,
  # should be fine remove on next release (if one ever happens)
  NIX_LDFLAGS = [
    "-lpthread"
  ];

  postInstall = "ln -s $out/bin/aegisub-* $out/bin/aegisub";

  meta = {
    description = "An advanced subtitle editor";
    longDescription = ''
      Aegisub is a free, cross-platform open source tool for creating and
      modifying subtitles. Aegisub makes it quick and easy to time subtitles to
      audio, and features many powerful tools for styling them, including a
      built-in real-time video preview.
    '';
    homepage = http://www.aegisub.org/;
    license = licenses.bsd3;
              # The Aegisub sources are itself BSD/ISC,
              # but they are linked against GPL'd softwares
              # - so the resulting program will be GPL
    maintainers = [ maintainers.AndersonTorres ];
    platforms = [ "i686-linux" "x86_64-linux" ];
  };
}