Can't compile: `Hyena.Widgets.RatingAccessible' does not implement interface member `Atk.IValue.GetValueAndText(out double, out string)'

[hopeseekr]

This error is reported other places on the internet, too.

./Hyena.Widgets/RatingEntry.cs(409,18): error CS0535: Hyena.Widgets.RatingAccessible' does not implement interface member Atk.IValue.GetValueAndText(out double, out string)'
/usr/lib/pkgconfig/../../lib/mono/gtk-sharp-3.0/atk-sharp.dll (Location of the symbol related to previous error)
./Hyena.Widgets/RatingEntry.cs(409,18): error CS0535: Hyena.Widgets.RatingAccessible' does not implement interface member Atk.IValueImplementor.GetValueAndText(out double, out string)'
/usr/lib/pkgconfig/../../lib/mono/gtk-sharp-3.0/atk-sharp.dll (Location of the symbol related to previous error)

[FabioLolix]

I have a similar error on Manjaro Linux

  MCS   ../../../bin/Hyena.Gui.dll
./Hyena.Data.Gui/Accessibility/ColumnCellAccessible.cs(82,22): warning CS0108: `Hyena.Data.Gui.Accessibility.ColumnCellAccessible.Layer' hides inherited member `Atk.Object.Layer'. Use the new keyword if hiding was intended
/usr/lib/pkgconfig/../../lib/mono/gtk-sharp-3.0/atk-sharp.dll (Location of the symbol related to previous warning)
./Hyena.Data.Gui/Accessibility/ColumnCellAccessible.cs(87,20): warning CS0108: `Hyena.Data.Gui.Accessibility.ColumnCellAccessible.MdiZorder' hides inherited member `Atk.Object.MdiZorder'. Use the new keyword if hiding was intended
/usr/lib/pkgconfig/../../lib/mono/gtk-sharp-3.0/atk-sharp.dll (Location of the symbol related to previous warning)
./Hyena.Gui/BaseWidgetAccessible.cs(59,26): warning CS0108: `Hyena.Gui.BaseWidgetAccessible.Layer' hides inherited member `Atk.Object.Layer'. Use the new keyword if hiding was intended
/usr/lib/pkgconfig/../../lib/mono/gtk-sharp-3.0/atk-sharp.dll (Location of the symbol related to previous warning)
./Hyena.Gui/BaseWidgetAccessible.cs(262,20): warning CS0108: `Hyena.Gui.BaseWidgetAccessible.MdiZorder' hides inherited member `Atk.Object.MdiZorder'. Use the new keyword if hiding was intended
/usr/lib/pkgconfig/../../lib/mono/gtk-sharp-3.0/atk-sharp.dll (Location of the symbol related to previous warning)
./Hyena.Widgets/RatingEntry.cs(413,26): error CS0234: The type or namespace name `ValueChangedHandler' does not exist in the namespace `Atk'. Are you missing an assembly reference?
./Hyena.Widgets/RatingEntry.cs(433,20): error CS0234: The type or namespace name `Range' does not exist in the namespace `Atk'. Are you missing an assembly reference?
Compilation failed: 2 error(s), 4 warnings