label_typed_build_setting example not working

[gregestren]

The README at https://github.com/bazelbuild/examples/tree/main/configurations/label_typed_build_setting says:

To test it out, cd to this directory and run the following:

$ bazel build :my-toolbox # "Using a hammer."

But this fails:

BUILD:8:8: every rule of type toolbox implicitly depends upon the target '//configurations/label_typed_build_setting:tool',
but this target could not be found because of: no such package 'configurations/label_typed_build_setting': BUILD file
not found in any of the following directories. Add a BUILD file to a directory to mark it as a package.