anchor.diff:        --prefix PYTHONPATH : "${vapoursynth}/lib/${python3.libPrefix}/site-packages:$PYTHONPATH"
     '';
   
  -  installPhase = ''
  -    python3 ${waf} install
  -
  +  postInstall = ''
       # Use a standard font
       mkdir -p $out/share/mpv
       ln -s ${freefont_ttf}/share/fonts/truetype/FreeSans.ttf $out/share/mpv/subfont.ttf
  
positive.code:   NIX_LDFLAGS = optionalString x11Support "-lX11 -lXext "
                + optionalString stdenv.isDarwin "-framework CoreFoundation";
  
    configureFlags = [
      "--enable-libmpv-shared"
      "--enable-manpage-build"
      "--disable-libmpv-static"
  
negative.code: { config, stdenv, fetchurl, fetchFromGitHub, makeWrapper
  , addOpenGLRunpath, docutils, perl, pkgconfig, python3, wafHook, which
  , ffmpeg_4, freefont_ttf, freetype, libass, libpthreadstubs, mujs
  , nv-codec-headers, lua, libuchardet, libiconv ? null, darwin
  
  