compile under Microsoft VC++

why have i an error when i compile with Visual C++? it is said that in gl.h :

expected ‘(’ to follow ‘WINGDIAPI’
the error is linked to the following code line in gl.h

WINGDIAPI void APIENTRY glAccum (GLenum op, GLfloat value);

Thanks for your help

I think you need to
#include <windows.h>

before <gl/gl.h>


thank you