def install(context):
    """
     Ordinarily, GenericSetup handlers check for the existence of XML files.
     Here, we are not parsing an XML file, but we use this text file as a
     flag to check that we actually meant for this import step to be run.
     The file is found in profiles/default.
    """
    if context.readDataFile('sc.galleria.support_default.txt') is None:
        return
