GLvoid

Using Win 10, Visual C++, have a program utilizing the OpenGL system, been running my C++ program for quite a while but now, when I upgraded to Win 10, I get an error when I try to link and run the program, using the following headers, as well as some standard windows headers:
gl\gl.h
gl\glu.h
gl\glaux.h
When I run the linker to create an executable module, I get an unresolved external variable int GLvoid. Obviously, I cannot execute the program until I get this unresoved fixed. Anyway input will be appreciated. Thanks