anchor.diff:  
   
       build =
  -      { tarball ? jobs.tarball {}
  -      , system ? "i686-linux"
  -      }:
  +      { system ? "i686-linux" }:
   
         with import nixpkgs {inherit system;};
   
  
positive.code:   
    makeDeb =
      system: diskImageFun: prio:
      { tarball ? jobs.tarball {}
      }:
  
      with import nixpkgs {inherit system;};
  
      releaseTools.debBuild {
        name = "nix-deb";
        src = tarball;
        diskImage = diskImageFun vmTools.diskImages;
        memSize = 1024;
        meta = { schedulingPriority = toString prio; };
        configureFlags = "--sysconfdir=/etc";
        debRequires = ["curl"];
      };
  
negative.code: { nix ? {outPath = ./.; rev = 1234;}
  , nixpkgs ? ../nixpkgs
  , officialRelease ? false
  }:
  
  let
  
  