def report_versions():
    """Creates a string that reports the version of xdress and all its
    dependencies.
    """
    vstr = """XDress: {xdress_version}
pycparser (optional): {pycparser_version}
lxml (optional): {lxml_version}
NumPy (optional): {numpy_version}
Cython (optional): {cython_version}"""
    return vstr.format(**globals())
