def METHOD_NAME(self, pkg1, pkg2):
    '''
    Returns a version comparison of the packages, where:
    -2 : pkg1 not comparable with pkg2
    -1 : pkg2 is newer than pkg1
     0 : pkg1 == pkg2
     1 : pkg1 is newer than pkg2
     2 : not implemented
    Needed to be implemented in a sub class
    '''
    return 2