Temporary header file '/tmp/2GR_Csxa_L/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/gvars3/GStringUtil.h"
  #include "/usr/include/gvars3/GUI.h"
  #include "/usr/include/gvars3/GUI_Fltk.h"
  #include "/usr/include/gvars3/GUI_Fltk2.h"
  #include "/usr/include/gvars3/GUI_Motif.h"
  #include "/usr/include/gvars3/GUI_Widgets.h"
  #include "/usr/include/gvars3/GUI_non_readline.h"
  #include "/usr/include/gvars3/GUI_readline.h"
  #include "/usr/include/gvars3/config.h"
  #include "/usr/include/gvars3/default.h"
  #include "/usr/include/gvars3/gvars3.h"
  #include "/usr/include/gvars3/instances.h"
  #include "/usr/include/gvars3/serialize.h"
  #include "/usr/include/gvars3/type_name.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/2GR_Csxa_L/dump1.h"

In file included from /usr/include/gvars3/serialize.h:12,
                 from /usr/include/gvars3/GStringUtil.h:15,
                 from /tmp/2GR_Csxa_L/dump1.h:12:
/usr/include/gvars3/default.h:15:10: fatal error: TooN/TooN.h: No such file or directory
   15 | #include <TooN/TooN.h>
      |          ^~~~~~~~~~~~~
compilation terminated.