Hi all, Going through the OpenGL Super Bible: 4th Ed. On the Example on page 157, I am getting an error at this line: Code: m3dRotationMatrix44(transformationMatrix, m3dDegToRad(yRot), 0.0f, 1.0f, 0.0f); The debugger gives this error: Code: ld: symbol(s) not found collect2: ld returned 1 exit status But this line is directly copied form the source code provided on the books website. I am using the same frameworks (except the cocoa, foundation ect.) and i am including the same files as the example. Any suggestions? Thanks Stephen EDIT: Also cannot get the next example on page 160 to work either same problem. I actually cannot find out what is wrong. There is no coding issues as I have simply copied the code provided. Also I should say the projects provided DOES work somehow :S.