Temporary header file '/tmp/afv21aXJX5/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/gxwmm/bigknob.h"
  #include "/usr/include/gxwmm/controlparameter.h"
  #include "/usr/include/gxwmm/eqslider.h"
  #include "/usr/include/gxwmm/fastmeter.h"
  #include "/usr/include/gxwmm/gainline.h"
  #include "/usr/include/gxwmm/hslider.h"
  #include "/usr/include/gxwmm/init.h"
  #include "/usr/include/gxwmm/iredit.h"
  #include "/usr/include/gxwmm/knob.h"
  #include "/usr/include/gxwmm/levelslider.h"
  #include "/usr/include/gxwmm/meterscale.h"
  #include "/usr/include/gxwmm/midknob.h"
  #include "/usr/include/gxwmm/minislider.h"
  #include "/usr/include/gxwmm/paintbox.h"
  #include "/usr/include/gxwmm/playhead.h"
  #include "/usr/include/gxwmm/portdisplay.h"
  #include "/usr/include/gxwmm/racktuner.h"
  #include "/usr/include/gxwmm/radiobutton.h"
  #include "/usr/include/gxwmm/regler.h"
  #include "/usr/include/gxwmm/selector.h"
  #include "/usr/include/gxwmm/simplevaluedisplay.h"
  #include "/usr/include/gxwmm/smallknob.h"
  #include "/usr/include/gxwmm/smallknobr.h"
  #include "/usr/include/gxwmm/switch.h"
  #include "/usr/include/gxwmm/toggleimage.h"
  #include "/usr/include/gxwmm/tuner.h"
  #include "/usr/include/gxwmm/valuedisplay.h"
  #include "/usr/include/gxwmm/vslider.h"
  #include "/usr/include/gxwmm/waveview.h"
  #include "/usr/include/gxwmm/wheel.h"
  #include "/usr/include/gxwmm/wheelvertical.h"
  #include "/usr/include/gxwmm/wrap_init.h"
  #include "/usr/include/gxwmm.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/afv21aXJX5/dump1.h"

In file included from /tmp/afv21aXJX5/dump1.h:12:
/usr/include/gxwmm/bigknob.h:6:10: fatal error: glibmm/ustring.h: No such file or directory
    6 | #include <glibmm/ustring.h>
      |          ^~~~~~~~~~~~~~~~~~
compilation terminated.