#
    # NOTE: If a non-empty API key was specified on the command line then
    #       add it to the global list now.
    #
    if {[string length $apiKey] > 0} then {
      lappend ::pkgr_api_keys $apiKey
    }

    #
    # NOTE: For Eagle, make sure that the [package unknown] handler will be
    #       used for the current interpreter.
    #
    if {[isEagle]} then {
      object invoke -flags +NonPublic Interpreter.GetActive InterpreterFlags \
          [appendArgs [object invoke -flags +NonPublic Interpreter.GetActive \
          InterpreterFlags] " -NoPackageUnknown"]
    }

    #
    # NOTE: Attempt to require the target package now.  If this succeeds
    #       -AND- the Package Downloader Client was used, the package will
    #       be persisted locally; otherwise, the [package ifneeded] script
    #       may still be evaluated; however, the effects may not actually
    #       cause anything to persist.