anchor.diff:      (lib.enableFeature sixelSupport    "sixel")
       (lib.enableFeature vaapiSupport    "vaapi")
       (lib.enableFeature waylandSupport  "wayland")
  -    (lib.enableFeature stdenv.isLinux  "dvbin")
  +    (lib.enableFeature dvbinSupport  "dvbin")
     ] # Disable whilst Swift isn't supported
       ++ lib.optional (!swiftSupport) "--disable-macos-cocoa-cb";
   
     nativeBuildInputs = [
       addOpenGLRunpath
  -    docutils
  +    docutils # for rst2man
       perl
       pkg-config
       python3
  
positive.code: , cacaSupport        ? true,           libcaca
  , cmsSupport         ? true,           lcms2
  , dvdnavSupport      ? stdenv.isLinux, libdvdnav
  , jackaudioSupport   ? false,          libjack2
  , javascriptSupport  ? true,           mujs
  , libpngSupport      ? true,           libpng
  , openalSupport      ? true,           openalSoft
  , pulseSupport       ? config.pulseaudio or stdenv.isLinux, libpulseaudio
  , rubberbandSupport  ? true,           rubberband
  , screenSaverSupport ? true,           libXScrnSaver
  , sdl2Support        ? true,           SDL2
  
negative.code: 
  , vulkanSupport ? stdenv.isLinux
    , libplacebo
    , shaderc # instead of spirv-cross
    , vulkan-headers
    , vulkan-loader
  
  