[Mono-osx] MonoDevelop and GTK

[Andrew Brehm]

When I try to compile a GTK# project (empty such, just a window), I
get the following message from MonoDevelop (several times):

"The type or namespace name `Gtk' could not be found. Are you missing
a using directive or an assembly reference?(CS0246)"

There is another message about the Gnome namespace.

Both messages refer to the actual "using" statements that include Gtk and Gnome.

I checked the references and can see gnome-sharp, Version=2.4.0 and
gtk-sharp, Version=2.4.0 in the "Selected references" list.

This is MonoDevelop and framework from Mono 1.2.6_6 on Mac OS X 10.5.2 on Intel.

What am I doing wrong?