anchor.diff:        };
   
   
  -    build = pkgs.lib.genAttrs systems (system:
  -
  -      let pkgs = import nixpkgs { inherit system; }; in
  -
  -      with pkgs;
  +    build = pkgs.lib.genAttrs (systems ++ crossSystems) (system:
  +
  +      let pkgs = if builtins.elem system systems
  +                 then import nixpkgs { inherit system; }
  +                 else import nixpkgs { crossSystem = { inherit system; }; };
  +      in with pkgs;
   
         with import ./release-common.nix { inherit pkgs; };
   
  
positive.code:       });
  
  
      binaryTarball = pkgs.lib.genAttrs systems (system:
  
        with import nixpkgs { inherit system; };
  
        let
          toplevel = builtins.getAttr system jobs.build;
  
negative.code: , nixpkgs ? builtins.fetchGit { url = https://github.com/NixOS/nixpkgs-channels.git; ref = "nixos-18.09"; }
  , officialRelease ? false
  , systems ? [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" ]
  , crossSystems ? [ "armv6l-linux" "armv7l-linux" ]
  }:
  
  let
  