LinuxCNC on Raspberry, missing initool.hh

Hello,
I installed LinuxCNC succesfully on Raspberry PI4 and now I'm playing a little bit configuring and customizing it.
I did some changes in the file "hal_gpio.c", the driver for GPIO control and I want to rebuild the software in order to apply my changes.
Well. in the directory "linuxcnc-dev/src" I call the command:

sudo make

and it works but after few seconds it stops with error:
"no rules to build object "../include/initool.hh", necessary for "headers".

What should I do to fix? Remove this file from a header? Create it.. but how? I'm not able to find the specific file on the web..

Thanks
Bye
Andrea

At the end I tried to create a mock file just to understand if it was the only issue.. and I got another error in the line after 

Finally, exaclty now.. I got the system built by myself following this video:
Install linuxcnc 2.8 on raspberry pi 3 B+ part3

Really cool because it is done step by step and at the contrary to some tutorial on a web page you can't face typing mistake,
sometime happens... 

Now I checkout again version 2.8 and it works!
Thanks a lot and hopefully this post could help someone else.

Bye
Andrea