FileChooserButton

[Joel Sinor <joel sinor gmail com>]

Hello,
I'm new to this mono stuff, and I am taking a shot that you guys might be able to give me some guidance with a compile problem I am having.  My search led me to you because apparently the widget in question is part of gtkmm.

I'm trying to compile the LotROLinux launcher (http://lotrolinux.com/)  in order to play DDO in Linux.  I believe I got all the right packages installed but clearly something is missing.  I installed gtkmm 2.10.10 via the slackbuild (I'm using slackware 12.0).

This is the error I am getting:
$ make 
/usr/bin/gmcs Main.cs MainWindow.cs AuthenticateUser.cs BaseConfig.cs GLSDataCentre.cs JoinWorldQueue.cs Realm.cs SecureHTTPOverride.cs StartGame.cs WorldQueueConfig.cs Language.cs LanguageConfig.cs SettingsWindow.cs PatchWindow.cs FirstRunWindow.cs SwitchGameWindow.cs MozillaStatus.cs DetermineOS.cs DetermineGame.cs Settings.cs Game.cs GameSelectWindow.cs -noconfig -codepage:utf8 -warn:3  -out:LotROLinux.run -target:exe -resource:LotROLinux.png -resource:LotROLinux.ico -resource:DDOLinux.png -resource:DDOLinux.ico -resource:MainWindow.glade -resource:FirstRunWindow.glade -resource:SwitchGameWindow.glade -resource:SettingsWindow.glade -resource:PatchWindowSimple.glade -resource:PatchWindow.glade -resource:GameSelectWindow.glade -r:System -r:System.Xml -r:System.Web -pkg:gtk-sharp-2.0 -pkg:glade-sharp-2.0  
SettingsWindow.cs(53,17): error CS0246: The type or namespace name `FileChooserButton' could not be found. Are you missing a using directive or an assembly reference?
Compilation failed: 1 error(s), 0 warnings
make: *** [LotROLinux.run] Error 1
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Do you have any suggestions on what I can check to make sure the right things are installed here and accessable?

-- 
Joel Sinor <joel sinor gmail com>