#
      # NOTE: Load a native Tcl library.  It must be signed with a valid
      #       Authenticode signature.
      #
      tcl load -findflags +TrustedOnly -loadflags +SetDllDirectory
    }

    if {$autoHook && ![isPackageUnknownHandlerHooked]} then {
      #
      # NOTE: Install our [package unknown] handler and save the original
      #       one for our use as well.
      #
      hookPackageUnknownHandler
    }
  }

  proc isPackageUnknownHandlerHooked {} {
    return [info exists [appendArgs \
        [getLookupVarNamePrefix] saved_package_unknown]]
  }

  proc hookPackageUnknownHandler {} {
    set varName [appendArgs [getLookupVarNamePrefix] saved_package_unknown]

    if {[info exists $varName]} then {
      error "package unknown handler already hooked"
    }