Porting oot modules to gr 3.9 and pybind

[Volker Schroer]

Hi,

I'm just started to port some of my oot modules to gr 3.9 and pybind. I
followed
https://wiki.gnuradio.org/index.php/GNU_Radio_3.9_OOT_Module_Porting_Guide

and it worked flawless for my first module gr-funcube.

Now I'm trying to port gr-display , which requires qt5 to be built.
When I run

gr_modtool bind display_text_msg

I get:
GNU Radio module name identified: display
INFO Parsing source file
"/home/schroer/gnuradiocomponents/gr-display.orig/include/display/display_text_msg.h"
...
/home/schroer/gnuradiocomponents/gr-display.orig/include/display/display_text_msg.h:33:10:
fatal error:
      'qapplication.h' file not found
#include <qapplication.h>
         ^~~~~~~~~~~~~~~~
1 error generated.
Error occurred while running CASTXML:  status:1


How can I come across this error ?

-- Volker