[MonoDevelop] "Pango" could not be found [Was: MonoDevelop 2.2 Beta 1 released]

[Adam Tauno Williams]

On Wed, 2009-09-09 at 18:13 +0200, Lluis Sanchez Gual wrote:
> The MonoDevelop team is proud to announce the release of MonoDevelop 2.2
> Beta 1 (2.1). This is the first release of a series of releases that
> will lead to MonoDevelop 2.2, hopefully around the end of October.

> MonoDevelop is a GNOME IDE primarily designed for C# and other .NET
> languages. MonoDevelop enables developers to quickly write desktop and
> ASP.NET Web applications on Linux, Windows and Mac OSX. MonoDevelop
> makes it easy for developers to port .NET applications created with
> Visual Studio to Linux and to maintain a single code base for all
> platforms.

Very exciting.  But I upgraded, opened my previously working project...
and now it fails to build with:

/home/awilliam/Works/Consonance/Whitemice.Gtk/Calendar/Whitemice.Gtk.Calendar/CalendarEvent.cs(185,7): error CS0246: The type or namespace name `Pango' could not be found. Are you missing a using directive or an assembly reference?
/home/awilliam/Works/Consonance/Whitemice.Gtk/Calendar/Whitemice.Gtk.Calendar/CalendarEvent.cs(299,7): error CS0246: The type or namespace name `Pango' could not be found. Are you missing a using directive or an assembly reference?

Hmmm.