VC++ compile errors when including gl.h

Question

Compiling a file that uses OpenGL with Visual C++, when I try to include the gl.h header file I get about 150 unhelpful compile errors:

error C2144: syntax error : 'void' should be preceded by ';'

error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

error C2146: syntax error : missing ';' before identifier 'glAccum'

etc.

Answer 1

Just #include <windows.h> before <gl/gl.h> or <gl/glu.h>. It is needed for some types, such as WINGDIAPI and APIENTRY.

Answer 2

Sounds like you're including a C header inside a C++ project. Try enclosing your include statement inside:

extern "C" {
#include "gl.h"
}