import sys
from modulegraph.modulegraph import MissingModule


def check(cmd, mf):
    if sys.version_info[0] != 2:
        return {}

    # Optional dependency on XML+ package in the stdlib, ignore
    # this when the package isn't present.
    m = mf.findNode('_xmlplus')
    if m is not None and isinstance(m, MissingModule):
        mf.removeReference(mf.findNode('xml'), m)

    return {}
