/usr/include/FL/glu.h is in libfltk1.3-dev 1.3.4-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | //
// "$Id: glu.h 8864 2011-07-19 04:49:30Z greg.ercolano $"
//
// GLu header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// You must include this instead of GL/gl.h to get the Microsoft
// APIENTRY stuff included (from <windows.h>) prior to the OpenGL
// header files.
//
// This file also provides "missing" OpenGL functions, and
// gl_start() and gl_finish() to allow OpenGL to be used in any window
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#ifndef FL_glu_H
# define FL_glu_H
# include "Enumerations.H" // for color names
# ifdef WIN32
# include <windows.h>
# endif
# ifndef APIENTRY
# if defined(__CYGWIN__)
# define APIENTRY __attribute__ ((__stdcall__))
# else
# define APIENTRY
# endif
# endif
# ifdef __APPLE__
# include <OpenGL/glu.h>
# else
# include <GL/glu.h>
# endif
#endif // !FL_glu_H
//
// End of "$Id: glu.h 8864 2011-07-19 04:49:30Z greg.ercolano $".
//
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