anchor.diff:    
     makeDeb =
       system: diskImageFun: prio:
  -    { tarball ? jobs.tarball {}
  -    }:
   
       with import nixpkgs {inherit system;};
   
       releaseTools.debBuild {
         name = "nix-deb";
  -      src = tarball;
  +      src = jobs.tarball;
         diskImage = diskImageFun vmTools.diskImages;
         memSize = 1024;
  -      meta = { schedulingPriority = toString prio; };
  +      meta.schedulingPriority = prio;
         configureFlags = "--sysconfdir=/etc";
         debRequires = ["curl"];
       };
  
positive.code: 
  
      coverage =
        { tarball ? jobs.tarball {}
        }:
  
        with import nixpkgs {};
  
        releaseTools.coverageAnalysis {
          name = "nix-build";
          src = tarball;
  
          buildInputs = [
            curl perl bzip2 openssl
            # These are for "make check" only:
            graphviz libxml2 libxslt
          ];
  
          configureFlags = ''
            --disable-init-state --disable-shared
            --with-aterm=${aterm} --with-bzip2=${bzip2} --with-sqlite=${sqlite}
          '';
  
          lcovFilter = ["*/boost/*" "*-tab.*"];
  
          # We call `dot', and even though we just use it to
          # syntax-check generated dot files, it still requires some
  
negative.code: 
  
      build =
        { system ? "i686-linux" }:
  
        with import nixpkgs {inherit system;};
  
  