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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def generate_doxygen_xml(app):
 """Run the doxygen make commands if we're on the ReadTheDocs server"""

    read_the_docs_build = os.environ.get('READTHEDOCS', None) == 'True'
    if read_the_docs_build:
        run_doxygen('..')
        sys.stderr.write('Check if shared lib exists\n')
        run_build_lib('..')
    sys.stderr.write('The wrapper path: %s\n' % str(os.listdir('../wrapper')))
    rabit._loadlib()