Ok...so i deserved to be snarflled or whatever it was...

Using Dev-C++ version 4.9.8.0

I'm not sure i could show you a simpler program than the one I'm having problesm with - so I'll copy all the code in making this post probably very very long. I'm working through a book...so i lack the know how to simplify it and replicate the error.

include <windows.h>

include <gl/gl.h>

include <gl/glu.h>

//Global Variables
float angle = 0.0f; //Current angle of triangle
HDC g_HDC; //global device ocntext
char szClassName[ ] = "WindowsApp"; // Make the class name into a global variable

//Funciton to set the pixel format
void SetupPixelFormat(HDC hDC)
{
int nPixelFormat; //Pixel format index

static PIXELFORMATDESCRIPTOR pfd = {
    sizeof(PIXELFORMATDESCRIPTOR),    //Size of structure
    1,                                //version, always set to 1
    PFD_DRAW_TO_WINDOW |                //Support window
    PFD_SUPPORT_OPENGL |                //support opengl
    PFD_DOUBLEBUFFER,                //support double buffering
    PFD_TYPE_RGBA,                        //RGBA color mode
    32,                                //32 bit color mode
    0, 0, 0, 0, 0, 0,                //ignore color bits - not used
    0,                                //No alpha buffer
    0,                                //ignor shift bit
    0,                                //no accumulation buffer
    0, 0, 0, 0,                        //ignore accumulation bits
    16,                                //16bit z-buffer size
    0,                                 //No stencil buffer
    0,                                //no auxilery plane
    PFD_MAIN_PLANE,                   //main drawing plane
    0,                                //reserved
    0, 0, 0 };                        //layer masks ignored

//choose best match
nPixelFormat = ChoosePixelFormat(hDC, &amp;pfd);
//set pixel format
SetPixelFormat(hDC, nPixelFormat, &amp;pfd);

}

/ Declare Windows procedure /
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain (HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil)

{
HWND hwnd; / This is the handle for our window /
MSG messages; / Here messages to the application are saved /
WNDCLASSEX wincl; / Data structure for the windowclass /
bool done;

/* The Window structure */
wincl.hInstance = hInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);        /* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL;                 /* No menu */
wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
wincl.cbWndExtra = 0;                      /* structure or the window instance */
/* Use Windows's default color as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&amp;wincl))
    return 0;

/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
       0,                   /* Extended possibilites for variation */
       szClassName,         /* Classname */
       &quot;Windows Application&quot;,       /* Title Text */
       WS_OVERLAPPEDWINDOW, /* default window */
       CW_USEDEFAULT,       /* Windows decides the position */
       CW_USEDEFAULT,       /* where the window ends up on the screen */
       544,                 /* The programs width */
       375,                 /* and height in pixels */
       HWND_DESKTOP,        /* The window is a child-window to desktop */
       NULL,                /* No menu */
       hInstance,       /* Program Instance handler */
       NULL                 /* No Window Creation data */
       );

/* Make the window visible on the screen */
ShowWindow (hwnd, nFunsterStil);
UpdateWindow (hwnd);

done = false;

while (!done)
{
    PeekMessage(&amp;messages, hwnd, 0, 0, PM_REMOVE); //pending message?
    if (messages.message == WM_QUIT)
    {
            done = true;
    }
    else
    {
            //do rendering here
            // clear screen and depth buffer
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
            glLoadIdentity();

            angle = angle + 0.1f; //increase your angle
            if (angle &gt;= 360.0f)
            {
                    angle = 0.0f;
            }
            glTranslatef(0.0f,0.0f,-5.0f);
            glRotatef(angle, 0.0f, 0.0f, 1.0f);

            glColor3f(1.0f,0.0f,0.0f);
            glBegin(GL_TRIANGLES);
                    glVertex3f(0.0f,0.0f,0.0f);
                    glVertex3f(1.0f,0.0f,0.0f);
                    glVertex3f(1.0f,1.0f,0.0f);
            glEnd();

            SwapBuffers(g_HDC);
            TranslateMessage(&amp;messages); //translate the message
            DispatchMessage(&amp;messages); //dispatch to windows
    }

}

/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;

}

/ This function is called by the Windows function DispatchMessage() /

LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{

static HGLRC hRC; //render Context
static HDC hDC; //Device Context
char string[] = &quot;Hello world!&quot;; //Text to be displayed
int width, height;   //window width and height

switch (message)                  /* handle the messages */
{
    case WM_CREATE:
            hDC = GetDC(hwnd);
            g_HDC = hDC;
            SetupPixelFormat(hDC);

            //create rendering context
            hRC = wglCreateContext(hDC);
            wglMakeCurrent(hDC, hRC);

            return 0;
            break;

    case WM_CLOSE:
            wglMakeCurrent(hDC, NULL);
            wglDeleteContext(hRC);

            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
            return 0;
            break;

    case WM_SIZE:
            height = HIWORD(lParam); //retreive width and height
            width = LOWORD(lParam);

            if (height==0)
            {
                    height = 1;
            }

            //reset teh viewport
            glViewport(0, 0, width, height);
            glMatrixMode(GL_PROJECTION);
            glLoadIdentity();

            //calculate aspet ratio
            gluPerspective(45.0f, (GLfloat)width/(GLfloat)height,1.0f,1000.0f);

            glMatrixMode(GL_MODELVIEW);
            glLoadIdentity();

            return 0;
            break;
    default:                      /* for messages that we don't deal with */
        return DefWindowProc (hwnd, message, wParam, lParam);
}

return 0;

}

Compiler: Default compiler
Building Makefile: "C:\Dev-Cpp\Projects\WindowsTest2\Makefile.win"
Executing make...
make.exe -f "C:\Dev-Cpp\Projects\WindowsTest2\Makefile.win" all
g++.exe -c main.cpp -o main.o -I"C:/Dev-Cpp/include/c++" -I"C:/Dev-Cpp/include/c++/mingw32" -I"C:/Dev-Cpp/include/c++/backward" -I"C:/Dev-Cpp/include"

g++.exe main.o -o "WinTest.exe" -L"C:/Dev-Cpp/lib" -mwindows

main.o(.text+0x186):main.cpp: undefined reference to glClear@4' main.o(.text+0x18e):main.cpp: undefined reference toglLoadIdentity@0'
main.o(.text+0x1d6):main.cpp: undefined reference to glTranslatef@12' main.o(.text+0x1ed):main.cpp: undefined reference toglRotatef@16'
main.o(.text+0x1fe):main.cpp: undefined reference to glColor3f@12' main.o(.text+0x20b):main.cpp: undefined reference toglBegin@4'
main.o(.text+0x21c):main.cpp: undefined reference to glVertex3f@12' main.o(.text+0x230):main.cpp: undefined reference toglVertex3f@12'
main.o(.text+0x247):main.cpp: undefined reference to glVertex3f@12' main.o(.text+0x24f):main.cpp: undefined reference toglEnd@0'
main.o(.text+0x32c):main.cpp: undefined reference to wglCreateContext@4' main.o(.text+0x348):main.cpp: undefined reference towglMakeCurrent@8'
main.o(.text+0x367):main.cpp: undefined reference to wglMakeCurrent@8' main.o(.text+0x378):main.cpp: undefined reference towglDeleteContext@4'
main.o(.text+0x3c9):main.cpp: undefined reference to glViewport@16' main.o(.text+0x3d6):main.cpp: undefined reference toglMatrixMode@4'
main.o(.text+0x3de):main.cpp: undefined reference to glLoadIdentity@0' main.o(.text+0x407):main.cpp: undefined reference togluPerspective@32'
main.o(.text+0x414):main.cpp: undefined reference to `glMatrixMode@4'

main.o(.text+0x41c):main.cpp: undefined reference to `glLoadIdentity@0'

make.exe: *** [WinTest.exe] Error 1

Execution terminated

[linker error] undefined reference to xxxx

Open Source C & C++ IDE for Windows

Forums

Help

[linker error] undefined reference to xxxx

include <windows.h>

include <gl/gl.h>

include <gl/glu.h>

[linker error] undefined reference to xxxx

Open Source C & C++ IDE for Windows

Forums

Help

[linker error] undefined reference to xxxx document.SUBSCRIPTION_OPTIONS = { "thing": "topic", "subscribed": false, "url": "subscribe", "icon": { "css": "fa fa-envelope-o" } };

include <windows.h>

include <gl/gl.h>

include <gl/glu.h>

[linker error] undefined reference to xxxx