anchor.diff:  
     buildPhase = ":";   # nothing to build
   
  -  icon = fetchurl {
  -    url = "https://www.getpostman.com/img/v2/media-kit/Logo/PNG/pm-logo-horiz.png";
  -    sha256 = "271b88317bd787f4a30ab374148e73314d60fb1b220ef791611774a061c49f30";
  -  };
  -
     desktopItem = makeDesktopItem {
       name = "postman";
       exec = "postman";
  -    icon = "${icon}";
  +    icon = "postman";
       comment = "API Development Environment";
       desktopName = "Postman";
       genericName = "Postman";
  
positive.code: 
    installPhase = ''
      mkdir -p $out/share/postman
      cp -R * $out/share/postman
  
      mkdir -p $out/bin
      ln -s $out/share/postman/Postman $out/bin/postman
  
      mkdir -p $out/share/applications
      ln -s ${desktopItem}/share/applications/* $out/share/applications/
    '';
  
    preFixup = let
  
negative.code: 
  stdenv.mkDerivation rec {
    name = "postman-${version}";
    version = "6.1.4";
  
    src = fetchurl {
      url = "https://dl.pstmn.io/download/version/${version}/linux64";
      sha256 = "2f93a860f87d842c0e0433b55cd7c46e04d1d20c0adcae8680332585dffd86eb";
      name = "${name}.tar.gz";
    };
  
  