Using debian's gcc (a prerelease of 3.3.2), compilation fails with this error:

../gnome--/app-helper.h: In member function `GnomeUIInfo* 
   Gnome::UI::Array<T_Info>::gtkobj() const [with T_Info = Gnome::UI::SubTree]
   ':
app.cc:110:   instantiated from here
../gnome--/app-helper.h:264: error: `GnomeUIInfo' is an inaccessible base of `
   Gnome::UI::Info'

I can currently workaround this by using a c-style cast instead of static_cast:

--- gnomemm-1.2.4.orig/src/gnome--/app-helper.h
+++ gnomemm-1.2.4/src/gnome--/app-helper.h
@@ -261,7 +261,8 @@
     { return static_cast<T_Info&>(begin_[n]); }
 
   GnomeUIInfo* gtkobj() const 
-    { return static_cast<GnomeUIInfo*>(data_); }
+    //{ return static_cast<GnomeUIInfo*>(data_); }
+    { return (GnomeUIInfo*)(data_); }
 
   vector<Info> make_return_vector(); //Used by get_uitree().
   vector<SubTree> make_return_vector_subtrees(); //Used by Gnome::App.