Always define the class destructor

simgear/scene/model/CheckSceneryVisitor.cxx

@@ -39,6 +39,10 @@ CheckSceneryVisitor::CheckSceneryVisitor(osgDB::DatabasePager* dbp, const osg::V
     setFrameStamp(framestamp);
 }
 
+CheckSceneryVisitor::~CheckSceneryVisitor()
+{
+}
+
 void CheckSceneryVisitor::apply(osg::Node& node)
 {
     traverse(node);

simgear/scene/model/CheckSceneryVisitor.hxx

@@ -37,6 +37,7 @@ class CheckSceneryVisitor : public osg::NodeVisitor
 {
 public:
     CheckSceneryVisitor(osgDB::DatabasePager* dbp, const osg::Vec3 &position, double range, osg::FrameStamp* framestamp);
+    ~CheckSceneryVisitor();
 
     virtual void apply(osg::Node& node);
     virtual void apply(osg::ProxyNode& node);