Emmett asked: The declarations in the Header file: gl.h are not being passed to the page with the dim sizeX as GLint >Question: >Can I solve this error by simply putting: >include "gl.h" at the top of the page that caused the error? Emmett, gl.h is the Apple Toolbox header. It has been translated to FB. Try adding the FB header: Tlbx glu.incl to your file. If you open Tlbx glu.incl, you will see that it also includes the definitions from Tlbx.gl.incl, which contains the definition for GLint. Ken Hint: You might want to open the "Headers" folder in your FB folder and acquaint yourself with the FB headers and their contents.