Temporary header file '/tmp/Yoe_9KM_jR/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/gxw/GxBigKnob.h"
  #include "/usr/include/gxw/GxControlParameter.h"
  #include "/usr/include/gxw/GxEQSlider.h"
  #include "/usr/include/gxw/GxFastMeter.h"
  #include "/usr/include/gxw/GxHSlider.h"
  #include "/usr/include/gxw/GxIREdit.h"
  #include "/usr/include/gxw/GxKnob.h"
  #include "/usr/include/gxw/GxLevelSlider.h"
  #include "/usr/include/gxw/GxMeterScale.h"
  #include "/usr/include/gxw/GxMidKnob.h"
  #include "/usr/include/gxw/GxMiniSlider.h"
  #include "/usr/include/gxw/GxPaintBox.h"
  #include "/usr/include/gxw/GxPlayHead.h"
  #include "/usr/include/gxw/GxPortDisplay.h"
  #include "/usr/include/gxw/GxRackTuner.h"
  #include "/usr/include/gxw/GxRadioButton.h"
  #include "/usr/include/gxw/GxRegler.h"
  #include "/usr/include/gxw/GxSelector.h"
  #include "/usr/include/gxw/GxSimpleValueDisplay.h"
  #include "/usr/include/gxw/GxSmallKnob.h"
  #include "/usr/include/gxw/GxSmallKnobR.h"
  #include "/usr/include/gxw/GxSwitch.h"
  #include "/usr/include/gxw/GxToggleImage.h"
  #include "/usr/include/gxw/GxTuner.h"
  #include "/usr/include/gxw/GxVSlider.h"
  #include "/usr/include/gxw/GxValueDisplay.h"
  #include "/usr/include/gxw/GxWaveView.h"
  #include "/usr/include/gxw/GxWheel.h"
  #include "/usr/include/gxw/GxWheelVertical.h"
  #include "/usr/include/gxw/drawingutils.h"
  #include "/usr/include/gxw/gainpoints.h"
  #include "/usr/include/gxw/gxinit.h"
  #include "/usr/include/gxw/log_meter.h"
  #include "/usr/include/gxw.h"

The GCC parameters:
  gcc -fdump-lang-raw -fkeep-inline-functions -c -x c++ -fpermissive -w "/tmp/Yoe_9KM_jR/dump1.h"

In file included from /usr/include/gxw/GxKnob.h:23,
                 from /usr/include/gxw/GxBigKnob.h:23,
                 from /tmp/Yoe_9KM_jR/dump1.h:12:
/usr/include/gxw/GxRegler.h:26:10: fatal error: gtk/gtk.h: No such file or directory
   26 | #include <gtk/gtk.h>
      |          ^~~~~~~~~~~
compilation terminated.