[Flightgear-devel] Please use SG_GL constants to include GL include files for portability

[ima . sudonim]

One more mac os x fix needed for flightgear (all files using GL 
includes for FlightGear or SimGear should now use

#include <simgear/compiler.h>
followed by
#include SG_GL_H
#include SG_GLU_H
#include SG_GLUT_H
#include SG_GLEX_H
(defined in compiler.h) as required. This will ensure that the 
necessary OpenGL or GLUT file is included in a portable fashion. (Apple 
broke portability with non-standard OpenGL include directory names)

Currently Cockpit/hud_rwy.cxx does not use the above compiler.h 
strategy and breaks mac os x builds

the line in hud_rwy.cxx
#include <GL/glu.h>
needs to be replaced by:
#include <simgear/compiler.h>
#include SG_GLU_H
Thanks!
Ima
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