{ stdenv, fetchurl, pkgconfig, openssl, curl, intltool, libevent
, file, inotifyTools
, enableGtk ? false, gtk ? null }:

assert enableGtk -> gtk != null;

stdenv.mkDerivation rec {
  name = "transmission-2.77"; # transmission >= 2.61 requires gtk3

  src = fetchurl {
    url = "http://download.transmissionbt.com/files/${name}.tar.xz";
    sha256 = "1phzhj4wds6r2ziclva1b5l6l9xjsx5ji7s3m4xia44aq4znbcam";
  };

  buildInputs = [ pkgconfig openssl curl intltool libevent
                  file inotifyTools ]
    ++ stdenv.lib.optional enableGtk gtk;

  preConfigure = ''
    sed -i -e 's|/usr/bin/file|${file}/bin/file|g' configure
  '';

  configureFlags = stdenv.lib.optionalString enableGtk "--with-gtk";

  postInstall = ''
    rm -f $out/share/icons/hicolor/icon-theme.cache
  '';

  meta = {
    description = "A fast, easy and free BitTorrent client";
    longDescription = ''
      Transmission is a BitTorrent client which features a simple interface
      on top of a cross-platform back-end.
      Feature spotlight:
        * Uses fewer resources than other clients
        * Native Mac, GTK+ and Qt GUI clients
        * Daemon ideal for servers, embedded systems, and headless use
        * All these can be remote controlled by Web and Terminal clients
        * Bluetack (PeerGuardian) blocklists with automatic updates
        * Full encryption, DHT, and PEX support
    '';
    homepage = http://www.transmissionbt.com/;
    license = [ "GPLv2" ];
    maintainers = [ stdenv.lib.maintainers.astsmtl ];
    platforms = stdenv.lib.platforms.linux;
  };
}