SDL doesn't depend on GLU, and overwhelming feedback from the mailing list is...

SDL doesn't depend on GLU, and overwhelming feedback from the mailing list is that people don't want it included in SDL_opengl.h

configure.in

@@ -1573,7 +1573,6 @@ CheckOpenGLX11()
         AC_TRY_COMPILE([
          #include <GL/gl.h>
          #include <GL/glx.h>
-         #include <GL/glu.h>
         ],[
         ],[
         video_opengl=yes

include/SDL_opengl.h

@@ -47,11 +47,9 @@
 #endif
 #if defined(__MACOSX__)
 #include <OpenGL/gl.h>          /* Header File For The OpenGL Library */
-#include <OpenGL/glu.h>         /* Header File For The GLU Library */
 #define __X_GL_H
 #else
 #include <GL/gl.h>              /* Header File For The OpenGL Library */
-#include <GL/glu.h>             /* Header File For The GLU Library */
 #endif
 #ifndef NO_SDL_GLEXT
 #undef __glext_h_