Undefined symbols for architecture i386:
  "typeinfo for Noesis::File::BaseFileSystem", referenced from:
      typeinfo for Noesis::Gui::OgreNsGuiFileSystem in OgreNsGuiFileSystem.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

namespace Noesis
{
	namespace Gui
	{
		////////////////////////////////////////////////////////////////////////////////////////////////////
		/// OgreFileSystem
		////////////////////////////////////////////////////////////////////////////////////////////////////
		class OgreNsGuiFileSystem: public File::BaseFileSystem
		{
		public:
			/// Constructor
			OgreNsGuiFileSystem(const NsChar* root);
			
			/// Destructor
			virtual ~OgreNsGuiFileSystem();
			
			/// From IFileSystem
			//@{
			NsBool FileExists(const File::FileId& filename) const;
			Ptr<Core::IStream> OpenRead(const File::FileId& filename) const;
			//@}
			
		private:
			const NsChar* mRoot;
			
		private:
			NS_DECLARE_REFLECTION(OgreNsGuiFileSystem, File::BaseFileSystem)
		};
		
	}
}