docs: def build(python=PYTHON):
      """Build the bigfloat library for in-place testing."""
      clean()
      local(
          "LIBRARY_PATH={library_path} CPATH={include_path} {python} "
          "setup.py build_ext --inplace".format(
              library_path=LIBRARY_PATH,
              include_path=INCLUDE_PATH,
              python=python,
          ))