...it is required as a public header, and was missed.
copy ..\..\..\atk\atkwindow.h $(CopyDir)\include\atk-$(AtkApiVersion)\atk
+copy ..\..\..\atk\atkversion.h $(CopyDir)\include\atk-$(AtkApiVersion)\atk
+
copy ..\..\..\atk\atk-enum-types.h $(CopyDir)\include\atk-$(AtkApiVersion)\atk
copy ..\..\..\atk\atkmisc.h $(OutDir)\include\atk-$(AtkApiVersion)\atk

copy ..\..\..\atk\atkvalue.h $(OutDir)\include\atk-$(AtkApiVersion)\atk

copy ..\..\..\atk\atkwindow.h $(OutDir)\include\atk-$(AtkApiVersion)\atk

+copy ..\..\..\atk\atkversion.h $(OutDir)\include\atk-$(AtkApiVersion)\atk

copy ..\..\..\atk\atk-enum-types.h $(OutDir)\include\atk-$(AtkApiVersion)\atk

mkdir $(OutDir)\lib