check for new and old flightgear path

src/comm/QGCFlightGearLink.cc

@@ -663,8 +663,14 @@ bool QGCFlightGearLink::connectSimulation()
     // that is pretty non-standard so we don't try to get fancy beyond hardcoding that path.
     fgAppDir.setPath("/Applications");
     fgAppName = "FlightGear.app";
+    // new path
     _fgProcessName = "./fgfs";
     _fgProcessWorkingDirPath = "/Applications/FlightGear.app/Contents/MacOS/";
+    if(!QFileInfo(_fgProcessWorkingDirPath + _fgProcessName).exists()){
+        // old path
+        _fgProcessName = "./fgfs.sh";
+        _fgProcessWorkingDirPath = "/Applications/FlightGear.app/Contents/Resources/";
+    }
     fgRootPathProposedList += "/Applications/FlightGear.app/Contents/Resources/data/";
 #elif defined Q_OS_WIN32
     _fgProcessName = "fgfs.exe";