#
    variable viaInstall; # DEFAULT: false

    if {![info exists viaInstall]} then {
      set viaInstall false
    }

    #
    # NOTE: This is the name of the executable file used to invoke the
    #       Mono implementation, possibly without a file extension.
    #
    variable monoFileNameOnly; # DEFAULT: <unset>

    if {![info exists monoFileNameOnly]} then {
      if {[isWindows]} then {
        set monoFileNameOnly mono.exe
      } else {
        set monoFileNameOnly mono
      }
    }

    #
    # NOTE: The command to use when attempting to verify that Mono and its
    #       associated runtimes are installed locally.  Generally, this is
    #       not needed on Windows machines.
    #
    variable monoInstalledCommand; # DEFAULT: mono --version

    if {![info exists monoInstalledCommand]} then {
      set monoInstalledCommand {mono --version}
      set monoInstalledCommand {{${monoFileNameOnly}} --version}
    }

    #
    # NOTE: The regular expression pattern used when attempting to verify
    #       that Mono and its associated runtimes are installed locally.
    #       Generally, this is not needed on Windows machines.
    #

  #
  # NOTE: This procedure attempts to verify that an instance of Mono and its
  #       associated runtimes are installed locally.  There are no arguments.
  #       The return value is non-zero if Mono appears to be installed and
  #       available for use; otherwise, the return value is zero.
  #
  proc isMonoInstalled {} {
    variable monoFileNameOnly
    variable monoInstalledCommand
    variable monoInstalledPattern

    if {[isEagle]} then {
      if {[catch {
        eval exec -success Success $monoInstalledCommand
        eval exec -success Success [subst $monoInstalledCommand]
      } result]} then {
        return false
      }
    } else {
      if {[catch {
        eval exec $monoInstalledCommand
        eval exec [subst $monoInstalledCommand]
      } result]} then {
        return false
      }
    }

    if {![info exists result] || \
        ![regexp -- $monoInstalledPattern $result]} then {