anchor.diff:        inherit sha256;
       };
   
  -  # Builds basic egg dists
  +  # Stage 1 pkgs, builds wheel dists
     buildBootstrapPythonPackage = makeOverridable (
       callPackage ../all-pkgs/b/build-python-package rec {
         stage = 1;
         namePrefix = python.libPrefix + "-stage1-";
  +
  +      # Stage 0 pkgs, builds basic egg dists
         appdirs = callPackage ../all-pkgs/a/appdirs/bootstrap.nix { };
         packaging = callPackage ../all-pkgs/p/packaging/bootstrap.nix {
           inherit
  
positive.code:     }
    );
  
    # Builds final wheel dists
    buildPythonPackage = makeOverridable (
      callPackage ../all-pkgs/b/build-python-package rec {
        stage = 2;
  
negative.code:      };
     };
  
     # DEPRECATED: required by testtools, remove this package if the dependency is dropped
     unittest2 = buildPythonPackage rec {
       version = "1.1.0";
       name = "unittest2-${version}";
  