Trying to get Derelict.opengl3.gl3 and derelict.glfw3.glfw3 to work together

[csmith via Digitalmars-d-learn]

Hi everyone,

I've got derelict.opengl3.gl3 and derelict.glfw3.glfw3 setup with 
dub and can get a window to open up and close with glfw3. I can 
also use glClear(GL_COLOR_BUFFER_BIT); however, beyond this most 
OpenGL commands fail and I can't seem to figure out how to fix it.

Code:

    import std.stdio;
    import derelict.opengl3.gl3, derelict.glfw3.glfw3;

    void main(string args[])
    {
        DerelictGL3.load(); // Loads OpenGL v1.0 and v1.1
        DerelictGLFW3.load(); // Loads GLFW3

        assert (glfwInit(), "Failed to initialize GLFW3");
        scope (exit) glfwTerminate();

        glfwSetErrorCallback(&error_callback);

        auto window = glfwCreateWindow(640, 480, "Simple 
example", null, null);	
        assert (window !is null);

        glfwMakeContextCurrent(window);
        auto vers = DerelictGL3.reload(); // Created GLFW3 
context, so GL3 needs to be reloaded
        
        while (!glfwWindowShouldClose(window)) {
            if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
                glfwSetWindowShouldClose(window, GL_TRUE);
                
            glClear(GL_COLOR_BUFFER_BIT);
            glBegin(GL_POINTS);
            glEnd();
                
            glfwSwapBuffers(window);
            glfwPollEvents();
        }

        glfwDestroyWindow(window);
        glfwTerminate();
    }

    extern (C) void error_callback(int error, const(char)* 
description) nothrow {
        printf("%s %s", error, description);
    }

Compiler Output:

    derelict-util: ["derelict-util"]
    derelict-util: ["derelict-util"]
    derelict-glfw3: ["derelict-glfw3", "derelict-util"]
    derelict-util: ["derelict-util"]
    derelict-gl3: ["derelict-gl3", "derelict-util"]
    myproj: ["myproj", "derelict-util", "derelict-glfw3", 
"derelict-util", "derelict-gl3", "derelict-util"]
    Target is up to date. Using existing build in 
/home/csmith/.dub/packages/derelict-util-1.0.2/.dub/build/library-debug-linux.posix-x86_64-dmd-A741715720F146208FFF241F87E468DD/. 
Use --force to force a rebuild.
    Target is up to date. Using existing build in 
/home/csmith/.dub/packages/derelict-glfw3-1.0.2/.dub/build/library-debug-linux.posix-x86_64-dmd-DD1819CE8266F370192AAD3190CA5B06/. 
Use --force to force a rebuild.
    Target is up to date. Using existing build in 
/home/csmith/.dub/packages/derelict-gl3-1.0.6/.dub/build/library-debug-linux.posix-x86_64-dmd-59B635D839F3A8CFC2737986D4B622FD/. 
Use --force to force a rebuild.
    Building myproj configuration "application", build type debug.
    Compiling...
    source/app.d(25): Error: undefined identifier glBegin
    source/app.d(26): Error: undefined identifier glEnd
    FAIL 
.dub/build/application-debug-linux.posix-x86_64-dmd-357CCD4CB91CACEC384AF7BAA514E3A7 
myproj executable
    Error executing command run: DMD compile run failed with exit 
code 1

Any ideas?

Thanks,
Charles