gistfile1.txt

    nixpkgs.overlays = [ (self: super: {
       duplicity = super.duplicity.overrideAttrs (oldAttrs: { 
         doCheck = false;
         # if this line is uncommented, tests run regardless of the above line:
         # propagatedBuildInputs = oldAttrs.propagatedBuildInputs ++ [ (pydrive pkgs).packages.PyDrive ];
         # with it commented, tests are skipped as expected
       });
     }
    )];