<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def deprecated_conditional(predicate, removal_version, entity_description, hint_message=None, stacklevel=4):
 """Marks a certain configuration as deprecated. The predicate is used to determine if that configuration is deprecated. It is a function that will be called, if true, then the deprecation warning will issue. :param () -> bool predicate: A function that returns True if the deprecation warning should be on. :param string removal_version: The pants version which will remove the deprecated functionality. :param string entity_description: A description of the deprecated entity. :param string hint_message: An optional hint pointing to alternatives to the deprecation. :param int stacklevel: How far up in the stack do we go to find the calling fn to report :raises DeprecationApplicationError if the deprecation is applied improperly. """

  validate_deprecation_semver(removal_version, 'removal version')
  if predicate():
    warn_or_error(removal_version, entity_description, hint_message, stacklevel=stacklevel)