anchor.diff:      meld
   
       # Haskell
  -    stack
  +    unstable.stack
   
       # Go
       go
  
positive.code: 
      # .NET
      mono46
      fsharp
      dotnetPackages.FSharpAutoComplete
      dotnetPackages.FSharpCompilerCodeDom
      dotnetPackages.FSharpCompilerService
  
negative.code: { config, pkgs, ... }:
  
  let
    unstable = (import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz) {
      inherit (config.nixpkgs) config system;
    }).pkgs;
  in
  {
    environment.systemPackages = with pkgs; [
      # Tools
      gnumake
  