My Visual Studio 2022 consistently gives me errors saying that the GLchar variable type is undefined

Question

I've been working on a little bit of code recently using the WIN32 API, GL.h, and GLU.h. I recently figured out that if I define a variable with the type GLchar my Visual Studio will give me an error saying that GLchar is an undefined identifier. Here's the error:

Severity    Code    Description Project File    Line    Suppression State   Details
Error (active)  E0020   identifier "GLchar" is undefined    RendGL  C:\Dev\RendGL\GLFunc.h  13`

Here's an MRE:

#include <Windows.h>
#include <GL/GL.h>
#include <GL/GLU.h>

int main() {
   const GLchar* string = "Example";
   return 0;
}

This code would result in:

Severity    Code    Description Project File    Line    Suppression State   Details
Error (active)  E0020   identifier "GLchar" is undefined    RendGL        C:\Dev\RendGL\GLFunc.h    13

I've scoured the internet for an answer, but haven't been able to find anything. Most of the posts that detail similar issues to mine have answers telling them to include a loading library or utility library before their GL, but I'm not using a loading library or utility library.