pkglint warning: ${PYPKGSRCDIR}" looks like a modifier but isn't

[Mayuresh <mayuresh%acm.org@localhost>]

What needs to be done regarding this warning that appears for a newly
created package:

    # pkglint -e
    WARN: ../../lang/python/pyversion.mk:178: The text ":${PYPKGSRCDIR}" looks like a modifier but isn't.
    
            The :from=to modifier consumes all the text until the end of the
            variable. There cannot be any further modifiers after it.

-- 
Mayuresh