{
  config,
  lib,
  stdenv,
  fetchFromGitHub,
  pkg-config,
  cmake,

  # dependencies
  glib,
  libXinerama,
  catch2,

  # lib.optional features without extra dependencies
  mpdSupport ? true,
  ibmSupport ? true, # IBM/Lenovo notebooks

  # lib.optional features with extra dependencies

  # ouch, this is ugly, but this gives the man page
  docsSupport ? true,
  docbook2x,
  libxslt ? null,
  man ? null,
  less ? null,
  docbook_xsl ? null,
  docbook_xml_dtd_44 ? null,

  ncursesSupport ? true,
  ncurses ? null,
  x11Support ? true,
  freetype,
  xorg,
  waylandSupport ? true,
  pango,
  wayland,
  wayland-protocols,
  wayland-scanner,
  xdamageSupport ? x11Support,
  libXdamage ? null,
  doubleBufferSupport ? x11Support,
  imlib2Support ? x11Support,
  imlib2 ? null,

  luaSupport ? true,
  lua ? null,
  luaImlib2Support ? luaSupport && imlib2Support,
  luaCairoSupport ? luaSupport && (x11Support || waylandSupport),
  cairo ? null,
  toluapp ? null,

  wirelessSupport ? true,
  wirelesstools ? null,
  nvidiaSupport ? false,
  libXNVCtrl ? null,
  pulseSupport ? config.pulseaudio or false,
  libpulseaudio ? null,

  curlSupport ? true,
  curl ? null,
  rssSupport ? curlSupport,
  weatherMetarSupport ? curlSupport,
  weatherXoapSupport ? curlSupport,
  journalSupport ? true,
  systemd ? null,
  libxml2 ? null,
}:

assert
  docsSupport
  ->
    docbook2x != null
    && libxslt != null
    && man != null
    && less != null
    && docbook_xsl != null
    && docbook_xml_dtd_44 != null;

assert ncursesSupport -> ncurses != null;

assert xdamageSupport -> x11Support && libXdamage != null;
assert imlib2Support -> x11Support && imlib2 != null;
assert luaSupport -> lua != null;
assert luaImlib2Support -> luaSupport && imlib2Support && toluapp != null;
assert luaCairoSupport -> luaSupport && toluapp != null && cairo != null;
assert luaCairoSupport || luaImlib2Support -> lua.luaversion == "5.4";

assert wirelessSupport -> wirelesstools != null;
assert nvidiaSupport -> libXNVCtrl != null;
assert pulseSupport -> libpulseaudio != null;

assert curlSupport -> curl != null;
assert rssSupport -> curlSupport && libxml2 != null;
assert weatherMetarSupport -> curlSupport;
assert weatherXoapSupport -> curlSupport && libxml2 != null;
assert journalSupport -> systemd != null;

stdenv.mkDerivation rec {
  pname = "conky";
  version = "1.19.6";

  src = fetchFromGitHub {
    owner = "brndnmtthws";
    repo = "conky";
    rev = "v${version}";
    hash = "sha256-L8YSbdk+qQl17L4IRajFD/AEWRXb2w7xH9sM9qPGrQo=";
  };

  postPatch =
    lib.optionalString docsSupport ''
      substituteInPlace cmake/Conky.cmake --replace "# set(RELEASE true)" "set(RELEASE true)"

      cp ${catch2}/include/catch2/catch.hpp tests/catch2/catch.hpp
    ''
    + lib.optionalString waylandSupport ''
      substituteInPlace src/CMakeLists.txt \
        --replace 'COMMAND ''${Wayland_SCANNER}' 'COMMAND wayland-scanner'
    '';

  env = {
    # For some reason -Werror is on by default, causing the project to fail compilation.
    NIX_CFLAGS_COMPILE = "-Wno-error";
    NIX_LDFLAGS = "-lgcc_s";
  };

  nativeBuildInputs =
    [
      cmake
      pkg-config
    ]
    ++ lib.optionals docsSupport [
      docbook2x
      docbook_xsl
      docbook_xml_dtd_44
      libxslt
      man
      less
    ]
    ++ lib.optional waylandSupport wayland-scanner
    ++ lib.optional luaImlib2Support toluapp
    ++ lib.optional luaCairoSupport toluapp;
  buildInputs =
    [
      glib
      libXinerama
    ]
    ++ lib.optional ncursesSupport ncurses
    ++ lib.optionals x11Support [
      freetype
      xorg.libICE
      xorg.libX11
      xorg.libXext
      xorg.libXft
      xorg.libSM
    ]
    ++ lib.optionals waylandSupport [
      pango
      wayland
      wayland-protocols
    ]
    ++ lib.optional xdamageSupport libXdamage
    ++ lib.optional imlib2Support imlib2
    ++ lib.optional luaSupport lua
    ++ lib.optional luaImlib2Support imlib2
    ++ lib.optional luaCairoSupport cairo
    ++ lib.optional wirelessSupport wirelesstools
    ++ lib.optional curlSupport curl
    ++ lib.optional rssSupport libxml2
    ++ lib.optional weatherXoapSupport libxml2
    ++ lib.optional nvidiaSupport libXNVCtrl
    ++ lib.optional pulseSupport libpulseaudio
    ++ lib.optional journalSupport systemd;

  cmakeFlags =
    [ ]
    ++ lib.optional docsSupport "-DMAINTAINER_MODE=ON"
    ++ lib.optional curlSupport "-DBUILD_CURL=ON"
    ++ lib.optional (!ibmSupport) "-DBUILD_IBM=OFF"
    ++ lib.optional imlib2Support "-DBUILD_IMLIB2=ON"
    ++ lib.optional luaCairoSupport "-DBUILD_LUA_CAIRO=ON"
    ++ lib.optional luaImlib2Support "-DBUILD_LUA_IMLIB2=ON"
    ++ lib.optional (!mpdSupport) "-DBUILD_MPD=OFF"
    ++ lib.optional (!ncursesSupport) "-DBUILD_NCURSES=OFF"
    ++ lib.optional rssSupport "-DBUILD_RSS=ON"
    ++ lib.optional (!x11Support) "-DBUILD_X11=OFF"
    ++ lib.optional waylandSupport "-DBUILD_WAYLAND=ON"
    ++ lib.optional xdamageSupport "-DBUILD_XDAMAGE=ON"
    ++ lib.optional doubleBufferSupport "-DBUILD_XDBE=ON"
    ++ lib.optional weatherMetarSupport "-DBUILD_WEATHER_METAR=ON"
    ++ lib.optional weatherXoapSupport "-DBUILD_WEATHER_XOAP=ON"
    ++ lib.optional wirelessSupport "-DBUILD_WLAN=ON"
    ++ lib.optional nvidiaSupport "-DBUILD_NVIDIA=ON"
    ++ lib.optional pulseSupport "-DBUILD_PULSEAUDIO=ON"
    ++ lib.optional journalSupport "-DBUILD_JOURNAL=ON";

  # `make -f src/CMakeFiles/conky.dir/build.make src/CMakeFiles/conky.dir/conky.cc.o`:
  # src/conky.cc:137:23: fatal error: defconfig.h: No such file or directory
  enableParallelBuilding = false;

  doCheck = true;

  meta = with lib; {
    homepage = "https://conky.cc";
    changelog = "https://github.com/brndnmtthws/conky/releases/tag/v${version}";
    description = "Advanced, highly configurable system monitor based on torsmo";
    mainProgram = "conky";
    maintainers = [ maintainers.guibert ];
    license = licenses.gpl3Plus;
    platforms = platforms.linux;
  };
}