anchor.diff:  , glib
   , gtk3
   , libhandy_0
  +, libsass
   , meson
   , ninja
   , pango
   , pkg-config
   , python3
  -, rustc
   , rustPlatform
   , wrapGAppsHook
   }:
   
  -rustPlatform.buildRustPackage rec {
  +stdenv.mkDerivation rec {
     pname = "contrast";
     version = "0.0.3";
   
  
positive.code:     ninja
      pkg-config
      python3
      wrapGAppsHook
      glib # for glib-compile-resources
    ];
  
negative.code:     glib
      gtk3
      libhandy_0
      libsass
      pango
    ];
  
    postPatch = ''
      patchShebangs build-aux/meson_post_install.py
    '';
  
    meta = with lib; {
      description = "Checks whether the contrast between two colors meet the WCAG requirements";
  