Temporary header file '/tmp/7k3jAxfHWX/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/ibtk/ibox.h"
  #include "/usr/include/ibtk/ibutton.h"
  #include "/usr/include/ibtk/idialogs.h"
  #include "/usr/include/ibtk/idodad.h"
  #include "/usr/include/ibtk/igbox.h"
  #include "/usr/include/ibtk/iintbox.h"
  #include "/usr/include/ibtk/ilistbox.h"
  #include "/usr/include/ibtk/irealbox.h"
  #include "/usr/include/ibtk/isbutton.h"
  #include "/usr/include/ibtk/islider.h"
  #include "/usr/include/ibtk/istatbar.h"
  #include "/usr/include/ibtk/itextbox.h"
  #include "/usr/include/ibtk/iwindow.h"
  #include "/usr/include/ibtk/pclaim.h"
  #include "/usr/include/ibtk/version.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/7k3jAxfHWX/dump1.h"

In file included from /tmp/7k3jAxfHWX/dump1.h:12:
/usr/include/ibtk/ibox.h:23:10: fatal error: X11/X.h: No such file or directory
   23 | #include <X11/X.h>
      |          ^~~~~~~~~
compilation terminated.