Fixed linux build.

qgroundcontrol.pri

@@ -202,7 +202,12 @@ message("Compiling for linux 32")
     DEPENDENCIES_PRESENT += osg
     # Include OpenSceneGraph libraries
     LIBS += -losg \
-            -losgViewer
+            -losgViewer \
+            -losgGA \
+            -losgDB \
+            -losgText \
+            -lOpenThreads
+
     DEFINES += QGC_OSG_ENABLED
     }
 
@@ -273,7 +278,12 @@ linux-g++-64 {
     DEPENDENCIES_PRESENT += osg
     # Include OpenSceneGraph libraries
     LIBS += -losg \
-            -losgViewer
+            -losgViewer \
+            -losgGA \
+            -losgDB \
+            -losgText \
+            -lOpenThreads
+
     DEFINES += QGC_OSG_ENABLED
     }
 
@@ -454,3 +464,4 @@ win32-g++ {
     # see http://osgearth.org/wiki/FAQ for details.
     QMAKE_CXXFLAGS += -Wl,-E
 }
+# vim:ts=4:sw=4:expandtab