anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "papirus-icon-theme";
  -  version = "20210302";
  +  version = "20210401";
   
     src = fetchFromGitHub {
       owner = "PapirusDevelopmentTeam";
       repo = pname;
       rev = version;
  -    sha256 = "0h1cja8qqlnddm92hkyhkyj5rqfj494v0pss2mg95qqkjijpcgd0";
  +    sha256 = "sha256-t0zoeIpj+0QVH1wmbEIJdqzEDOGzpclePv+bcZgtnwo=";
     };
   
     nativeBuildInputs = [
  
positive.code:     license = licenses.gpl3Only;
      # darwin gives hash mismatch in source, probably because of file names differing only in case
      platforms = platforms.linux;
      maintainers = with maintainers; [ romildo ];
    };
  }
  
negative.code:   dontDropIconThemeCache = true;
  
    installPhase = ''
      runHook preInstall
      mkdir -p $out/share/icons
      mv {,e}Papirus* $out/share/icons
  
      for theme in $out/share/icons/*; do
        gtk-update-icon-cache $theme
      done
      runHook postInstall
    '';
  
    meta = with lib; {
  