Temporary header file '/tmp/dNV1KbDGZ7/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/gpiv/gpiv-cam.h"
  #include "/usr/include/gpiv/gpiv-genpar.h"
  #include "/usr/include/gpiv/gpiv-img.h"
  #include "/usr/include/gpiv/gpiv-img_utils.h"
  #include "/usr/include/gpiv/gpiv-imgproc.h"
  #include "/usr/include/gpiv/gpiv-io.h"
  #include "/usr/include/gpiv/gpiv-piv.h"
  #include "/usr/include/gpiv/gpiv-piv_par.h"
  #include "/usr/include/gpiv/gpiv-piv_utils.h"
  #include "/usr/include/gpiv/gpiv-post.h"
  #include "/usr/include/gpiv/gpiv-post_par.h"
  #include "/usr/include/gpiv/gpiv-post_utils.h"
  #include "/usr/include/gpiv/gpiv-trig.h"
  #include "/usr/include/gpiv/gpiv-utils.h"
  #include "/usr/include/gpiv/gpiv-utils_alloc.h"
  #include "/usr/include/gpiv/gpiv-valid.h"
  #include "/usr/include/gpiv/gpiv-valid_par.h"
  #include "/usr/include/gpiv.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/dNV1KbDGZ7/dump1.h"

In file included from /tmp/dNV1KbDGZ7/dump1.h:29:
/usr/include/gpiv.h:196:10: fatal error: gsl/gsl_fit.h: No such file or directory
  196 | #include <gsl/gsl_fit.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.