variable autoLoadTcl; # DEFAULT: <automatic>

    if {![info exists autoLoadTcl]} then {
      #
      # TODO: Better automatic detection of native Tcl installs here?
      #
      if {[isEagle] && \
          [catch {tcl select -architecture}] == 0} then {
          [catch {tcl select -flags +TrustedOnly -architecture}] == 0} then {
        set autoLoadTcl true
      } else {
        set autoLoadTcl false
      }
    }

    #