diff -ru jackmix-0.3/libcore/guiserver_interface.h jackmix-0.3-edit/libcore/guiserver_interface.h
--- jackmix-0.3/libcore/guiserver_interface.h	2007-03-30 18:35:37.000000000 +0200
+++ jackmix-0.3-edit/libcore/guiserver_interface.h	2007-04-01 15:38:54.000000000 +0200
@@ -13,6 +13,9 @@
 class GuiServer_Interface
 {
 public:
+
+	virtual ~GuiServer_Interface() { }
+
 	virtual void message( const QString& title, const QString& text ) const =0;
 	virtual bool messageYesNo( const QString& title, const QString& text ) const =0;
 	virtual bool messageOkCancel( const QString& title, const QString& text ) const =0;