def __init__(self, *args, **kwargs):
        # bootstrap keeping only one copy of these around
        self.bootstrapPythonFlags = None
        self.bootstrapSysPath = []
        self.bootstrapPerlIncPath = []
        self.bootstrapRubyLibs = []
        self.cachedProviders = {}
        self.pythonFlagNamespace = None
        self.removeFlagsByDependencyClass = None # pre-transform
        self.removeFlagsByDependencyClassMap = {}