anchor.diff:      outputFiles = [ "Lib/Net40/*" ];
     };
   
  +  FSharpFormatting = fetchNuGet {
  +    baseName = "FSharp.Formatting";
  +    version = "2.9.8";
  +    sha256 = "1bswcpa68i2lqds4kkl2qxgkfrppbpxa4jkyja48azljajh0df3m";
  +    outputFiles = [ "lib/net40/*" ];
  +  };
  +
     NUnit = fetchNuGet {
       baseName = "NUnit";
       version = "2.6.4";
  
positive.code:     baseName = "FSharp.Data";
      version = "2.2.3";
  
      src = fetchurl {
        name = "${baseName}-${version}.tar.gz";
        url = "https://github.com/fsharp/FSharp.Data/archive/${version}.tar.gz";
        sha256 = "162ncwjyc74ndh3m5dpppg9aag1f8ijkjwv5dx0mid3mw592bjh1";
      };
  
      buildInputs = [ fsharp ];
  
negative.code: 
    # SOURCE PACKAGES
  
    Deedle = buildDotnetPackage rec {
      baseName = "Deedle";
      version = "1.2.0";
  
      src = fetchFromGitHub {
        owner = "BlueMountainCapital";
        repo = baseName;
        rev = "v${version}";
        sha256 = "115zzh3q57w8wr02cl2v8wijnj1rg01j1mk9zbzixbb4aird72n5";
      };
  
      # Enough files from this repo are needed that it will be quicker to just get the entire repo
      fsharpDataSrc = fetchFromGitHub {
        owner = "fsharp";
        repo = "FSharp.Data";
        rev = "2.2.3";
        sha256 = "1h3v9rc8k0khp61cv5n01larqbxd3xcx3q52sw5zf9l0661vw7qr";
      };
  
      buildInputs = [
        fsharp
        dotnetPackages.FsCheck
        dotnetPackages.FSharpCompilerService
        dotnetPackages.FSharpData
        dotnetPackages.FSharpFormatting
        dotnetPackages.MathNetNumerics
        dotnetPackages.NUnit
      ];
  
      preConfigure = ''
        mkdir -vp paket-files/fsharp
        ln -sv ${fsharpDataSrc} paket-files/fsharp/FSharp.Data
      '';
  
      xBuildFiles = [ "Deedle.Core.sln" ];  # Come back later to get RProvider as well
      outputFiles = [ "bin/*" "LICENSE.md" ];
  
      meta = {
        description = "Deedle is an easy to use library for data and time series manipulation and for scientific programming";
        homepage = "http://bluemountaincapital.github.io/Deedle/";
        license = stdenv.lib.licenses.free;
        maintainers = with stdenv.lib.maintainers; [ obadz ];
        platforms = with stdenv.lib.platforms; linux;
      };
    };
  
    ExcelDna = buildDotnetPackage rec {
      baseName = "Excel-DNA";
      version = "0.32.0";
  