anchor.diff:  
     open = mkDerivation {
       pluginName = "open";
  -    src = fetchgit {
  -      url = "https://github.com/tmux-plugins/tmux-open";
  -      rev = "f99d3189c445188eae5fa9bfeabc95df16deca92";
  -      sha256 = "13q3zd5jv7akkjjwhgimmfylrvalxdn54fnpfb14g6xam6h8808m";
  +    version = "unstable-2019-12-02";
  +    src = fetchFromGitHub {
  +      owner = "tmux-plugins";
  +      repo = "tmux-open";
  +      rev = "cedb4584908bd8458fadc8d3e64101d3cbb48d46";
  +      sha256 = "10s0xdhmg0dhpj13ybcq72pw3xgb2dq5v5h2mwidzqyh9g17wndh";
       };
     };
   
     pain-control = mkDerivation {
       pluginName = "pain-control";
  -    src = fetchgit {
  -      url = "https://github.com/tmux-plugins/tmux-pain-control";
  -      rev = "731667692da46d51a6a9dffb4c43384a5d68ff28";
  -      sha256 = "1ihpl5wgjmhfgcrasgnydd7vpsar865sx2whra19gpfm4bglmdzl";
  -    };
  -  };
  -
  -  plumb = mkDerivation {
  +    version = "unstable-2020-02-18";
  +    src = fetchFromGitHub {
  +      owner = "tmux-plugins";
  +      repo = "tmux-pain-control";
  +      rev = "2db63de3b08fc64831d833240749133cecb67d92";
  +      sha256 = "0w7a6n4n86ysiqcqj12j2hg9r5fznvbp3dz8pzas9q1k3avlk0zk";
  +    };
  +  };
  +
  +  plumb = mkDerivation rec {
       pluginName = "plumb";
  +    version = "0.1.1";
       src = fetchFromGitHub {
         owner = "eraserhd";
         repo = "tmux-plumb";
  -      rev = "v0.1.1";
  +      rev = "v${version}";
         sha256 = "1c6k4fdl0az9811r6k164mgd4w5la75xr6x7nabmy046xc0z5i2r";
       };
       postInstall = ''
  
positive.code: 
    urlview = mkDerivation {
      pluginName = "urlview";
      src = fetchgit {
        url = "https://github.com/tmux-plugins/tmux-urlview";
        rev = "b84c876cffdd22990b4ab51247e795cbd7813d53";
        sha256 = "1jp4jq57cn116b3i34v6yy69izd8s6mp2ijr260cw86g0470k0fn";
      };
  
negative.code: { lib
  , fetchFromGitHub
  , pkgs
  , reattach-to-user-namespace
  , stdenv
  