anchor.diff:  
   perlPackages.buildPerlPackage rec {
     pname = "feedgnuplot";
  -  version = "1.58";
  +  version = "1.61";
   
     src = fetchFromGitHub {
       owner = "dkogan";
       repo = "feedgnuplot";
       rev = "v${version}";
  -    sha256 = "1qix4lwwyhqibz0a6q2rrb497rmk00v1fvmdyinj0dqmgjw155zr";
  +    sha256 = "sha256-r5rszxr65lSozkUNaqfBn4I4XjLtvQ6T/BG366JXLRM=";
     };
   
     outputs = [ "out" ];
   
  -  nativeBuildInputs = [ makeWrapper ] ++ lib.optional stdenv.isDarwin shortenPerlShebang;
  +  nativeBuildInputs = [ makeWrapper installShellFiles ] ++ lib.optional stdenv.isDarwin shortenPerlShebang;
   
     buildInputs = [ gnuplot perl ]
       ++ (with perlPackages; [ ListMoreUtils IPCRun StringShellQuote ]);
  
positive.code: { lib, fetchFromGitHub, makeWrapper
  , makeFontsConf, freefont_ttf, gnuplot, perl, perlPackages
  , stdenv, shortenPerlShebang
  }:
  
  let
  
negative.code:     wrapProgram $out/bin/feedgnuplot \
          --prefix "PATH" ":" "$PATH" \
          --prefix "PERL5LIB" ":" "$PERL5LIB"
  
      installShellCompletion --bash --name feedgnuplot.bash completions/bash/feedgnuplot
      installShellCompletion --zsh completions/zsh/_feedgnuplot
    '';
  
    meta = with lib; {
  