From Stephan Huber, " I am getting a warning that the class DataOutputStream has virtual

methods but no virtual d'tor, so I added the keyword virtual to the destructor."

src/osgPlugins/ive/DataOutputStream.h

@@ -34,7 +34,7 @@ class DataOutputStream{
 
 public:
     DataOutputStream(std::ostream* ostream, const osgDB::ReaderWriter::Options* options);
-    ~DataOutputStream();
+    virtual ~DataOutputStream();
 
     const osgDB::ReaderWriter::Options* getOptions() const { return _options.get(); }