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GtkSharp generation throws NotSupportedException

With ninja -C build update-all,

there is the following compiler error:

Unhandled Exception:
System.NotSupportedException: Cannot generate virtual method Allocator.OnAlloc ((ulong) size, Gst.AllocationParams.New (parms)). Make sure a writable glue path was provided to the generator.
  at GtkSharp.Generation.GObjectVM.Generate (GtkSharp.Generation.GenerationInfo gen_info, GtkSharp.Generation.ObjectBase implementor) [0x00063] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/GObjectVM.cs:66 
  at GtkSharp.Generation.ObjectBase.GenVirtualMethods (GtkSharp.Generation.GenerationInfo gen_info, GtkSharp.Generation.ObjectBase implementor) [0x0001d] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/ObjectBase.cs:300 
  at GtkSharp.Generation.ObjectGen.GenClassMembers (GtkSharp.Generation.GenerationInfo gen_info, System.String cs_parent) [0x00004] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/ObjectGen.cs:313 
  at GtkSharp.Generation.ObjectGen.Generate (GtkSharp.Generation.GenerationInfo gen_info) [0x003aa] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/ObjectGen.cs:199 
  at GtkSharp.Generation.CodeGenerator.Main (System.String[] args) [0x00586] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/CodeGenerator.cs:150 
[ERROR] FATAL UNHANDLED EXCEPTION: System.NotSupportedException: Cannot generate virtual method Allocator.OnAlloc ((ulong) size, Gst.AllocationParams.New (parms)). Make sure a writable glue path was provided to the generator.
  at GtkSharp.Generation.GObjectVM.Generate (GtkSharp.Generation.GenerationInfo gen_info, GtkSharp.Generation.ObjectBase implementor) [0x00063] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/GObjectVM.cs:66 
  at GtkSharp.Generation.ObjectBase.GenVirtualMethods (GtkSharp.Generation.GenerationInfo gen_info, GtkSharp.Generation.ObjectBase implementor) [0x0001d] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/ObjectBase.cs:300 
  at GtkSharp.Generation.ObjectGen.GenClassMembers (GtkSharp.Generation.GenerationInfo gen_info, System.String cs_parent) [0x00004] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/ObjectGen.cs:313 
  at GtkSharp.Generation.ObjectGen.Generate (GtkSharp.Generation.GenerationInfo gen_info) [0x003aa] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/ObjectGen.cs:199 
  at GtkSharp.Generation.CodeGenerator.Main (System.String[] args) [0x00586] in /home/aaron/src/gstreamer-sharp/subprojects/gtk-sharp/Source/generator/CodeGenerator.cs:150
Edited by Aaron Boxer