if {![package vsatisfies [package provide Tcl] 8.4]} then {return} 
if {[string length [package provide Eagle]] > 0} then {return} 
 
package ifneeded HelloWorld 1.0 [list apply [list { dir } { 
  set command [list exec] 
  if {![isWindows]} then {lappend command mono} 
  puts stdout [exec [file join $dir HelloWorld.exe]] 
  lappend command [file join $dir HelloWorld.exe] 
  puts stdout [eval $command] 
  package provide HelloWorld 1.0 
}] $dir]