我尝试编译当前版本的 Mono.Addins，但失败并显示以下错误消息：
Building Mono.Addins.Gui.csproj
/usr/lib/mono/4.0/Microsoft.Common.targets: warning : Reference 'glib-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f' not resolved
/usr/lib/mono/4.0/Microsoft.Common.targets: warning : Reference 'pango-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f' not resolved
/usr/lib/mono/4.0/Microsoft.Common.targets: warning : Reference 'atk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f' not resolved
/usr/lib/mono/4.0/Microsoft.Common.targets: warning : Reference 'gdk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f' not resolved
/usr/lib/mono/4.0/Microsoft.Common.targets: warning : Reference 'gtk-sharp, Version=2.12.0.0, Culture=neutral, PublicKeyToken=35e10195dab3c99f' not resolved
Mono.Addins.Gui/AddinManagerDialog.cs(30,7): error CS0246: The type or namespace name Gtk' could not be found. Are you missing an assembly reference?
Mono.Addins.Gui/AddinTreeWidget.cs(32,7): error CS0246: The type or namespace nameGtk' could not be found. Are you missing an assembly reference?
Mono.Addins.Gui/AddinTreeWidget.cs(33,7): error CS0246: The type or namespace name Gdk' could not be found. Are you missing an assembly reference?
Mono.Addins.Gui/ManageSitesDialog.cs(31,7): error CS0246: The type or namespace nameGtk' could not be found. Are you missing an assembly reference?
我已经从源代码中安装了当前版本的 Mono 和 Gtk#。知道出了什么问题吗？