anchor.diff:    dontUnpack = true;
   
     installPhase = ''
  +    runHook preInstall
  +
       mkdir -p "$out/bin"
       cp "$src" "$out/bin/eplot"
       cp "$ecSrc" "$out/bin/ec"
       chmod +x "$out/bin/"*
   
       sed -i -e "s|gnuplot -persist|${gnuplot}/bin/gnuplot -persist|" "$out/bin/eplot"
  +
  +    runHook postInstall
     '';
   
     meta = with lib; {
  
positive.code: { lib, stdenv, fetchurl, gnuplot, ruby }:
  
  stdenv.mkDerivation {
    name = "eplot-2.07";
  
    # Upstream has been contacted (2015-03) regarding providing versioned
    # download URLs. Initial response was positive, but no action yet.
  
negative.code:       This package also includes the complementary 'ec' tool (say "extract
        column").
      '';
      homepage = "https://perso.liris.cnrs.fr/christian.wolf/software/eplot/";
      license = licenses.gpl2Plus;
      platforms = platforms.all;
      maintainers = with maintainers; [ bjornfor shamilton ];
    };
  }
  