Temporary header file '/tmp/fW6eH8wuVn/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/XmHTML/Balloon.h"
  #include "/usr/include/XmHTML/BalloonP.h"
  #include "/usr/include/XmHTML/HTML.h"
  #include "/usr/include/XmHTML/HTMLStrings.h"
  #include "/usr/include/XmHTML/XCC.h"
  #include "/usr/include/XmHTML/XCCP.h"
  #include "/usr/include/XmHTML/XmHTML.h"
  #include "/usr/include/XmHTML/XmHTMLP.h"
  #include "/usr/include/XmHTML/XmHTMLfuncs.h"
  #include "/usr/include/XmHTML/debug_menu.h"
  #include "/usr/include/XmHTML/resources.h"
  #include "/usr/include/XmHTML/tka.h"
  #include "/usr/include/XmHTML/toolkit.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/fW6eH8wuVn/dump1.h"  -I/usr/include/freetype2

In file included from /tmp/fW6eH8wuVn/dump1.h:19:
/usr/include/XmHTML/XmHTMLP.h:109:10: fatal error: X11/Xmu/Atoms.h: No such file or directory
  109 | #include <X11/Xmu/Atoms.h>      /* must be below, it includes X11/Intrinsic.h */
      |          ^~~~~~~~~~~~~~~~~
compilation terminated.