Temporary header file '/tmp/Bufc0rfLrV/dump1.h' with the following content will be compiled to create GCC translation unit dump:

  // add defines
  #define __STDC_VERSION__ 201710L
#define _GXX_NULLPTR_T
#define CLUTTER_ENABLE_COMPOSITOR_API 1
#define _REGEX_NELTS(n)
#define _Atomic
#define PACKED
#define getaddrinfo_a(a,b,c,d)

  // add includes
  #include "/usr/include/SDL/SDL.h"
  #include "/usr/include/SDL/SDL_active.h"
  #include "/usr/include/SDL/SDL_audio.h"
  #include "/usr/include/SDL/SDL_byteorder.h"
  #include "/usr/include/SDL/SDL_cdrom.h"
  #include "/usr/include/SDL/SDL_config.h"
  #include "/usr/include/SDL/SDL_copying.h"
  #include "/usr/include/SDL/SDL_cpuinfo.h"
  #include "/usr/include/SDL/SDL_endian.h"
  #include "/usr/include/SDL/SDL_error.h"
  #include "/usr/include/SDL/SDL_events.h"
  #include "/usr/include/SDL/SDL_getenv.h"
  #include "/usr/include/SDL/SDL_joystick.h"
  #include "/usr/include/SDL/SDL_keyboard.h"
  #include "/usr/include/SDL/SDL_keysym.h"
  #include "/usr/include/SDL/SDL_loadso.h"
  #include "/usr/include/SDL/SDL_main.h"
  #include "/usr/include/SDL/SDL_mouse.h"
  #include "/usr/include/SDL/SDL_mutex.h"
  #include "/usr/include/SDL/SDL_name.h"
  #include "/usr/include/SDL/SDL_opengl.h"
  #include "/usr/include/SDL/SDL_platform.h"
  #include "/usr/include/SDL/SDL_quit.h"
  #include "/usr/include/SDL/SDL_rwops.h"
  #include "/usr/include/SDL/SDL_stdinc.h"
  #include "/usr/include/SDL/SDL_syswm.h"
  #include "/usr/include/SDL/SDL_thread.h"
  #include "/usr/include/SDL/SDL_timer.h"
  #include "/usr/include/SDL/SDL_types.h"
  #include "/usr/include/SDL/SDL_version.h"
  #include "/usr/include/SDL/SDL_video.h"
  #include "/usr/include/SDL/begin_code.h"
  #include "/usr/include/SDL/close_code.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/Bufc0rfLrV/dump1.h"

In file included from /tmp/Bufc0rfLrV/dump1.h:32:
/usr/include/SDL/SDL_opengl.h:50:10: fatal error: GL/gl.h: No such file or directory
   50 | #include <GL/gl.h>      /* Header File For The OpenGL Library */
      |          ^~~~~~~~~
compilation terminated.