/usr/include/allegrogl/gl_header_detect.h is in liballeggl4-dev 2:4.4.2-10.
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 | #ifndef INCLUDE_ALLEGRO_GL_HEADER_DETECT_H_GUARD
#define INCLUDE_ALLEGRO_GL_HEADER_DETECT_H_GUARD
/* Some GL headers are broken - they don't define ARB_imaging when they should
*/
#if defined GL_CONVOLUTION_FORMAT && !defined GL_ARB_imaging
#define GL_ARB_imaging 1
#endif
/* NV header detection */
#ifdef GL_FORCE_SOFTWARE_NV
#define AGL_HEADER_NV 1
#endif
#endif
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