Installing nibegw on Raspberry Pi Zero W

Dear Cogniscenti,
I am trying to connect a Pi Zero with a RS485 CAN HAT to my Nibe SMO40.
I have installed the CAN related software on the Pi Zero but I have got stuck with the Openhab software.
I have created a directory under by home directory, created the file nibegw.c and copied the Openhab nibegw.c file into it.
But when I run the compilation program, nothing happens.
I then ran gcc -Wall -std=gnu99 -o nibegw nibegw.c and I get the following:

nibegw.c: In function ‘getTimeStamp’:
nibegw.c:205:42: warning: format ‘%d’ expects argument of type ‘int’, but argument 9 has type ‘__suseconds_t’ {aka ‘long int’} [-Wformat=]
  205 |  sprintf(buffer, "%d.%d.%d %d:%02d:%02d:%d",
      |                                         ~^
      |                                          |
      |                                          int
      |                                         %ld
  210 |      tm->tm_min, tm->tm_sec, tv.tv_usec
      |                              ~~~~~~~~~~
      |                                |
      |                                __suseconds_t {aka long int}

What is the corrective action I need to take here please?
Thank you very much for your advice.

Wrong forum ? This is the Home Assistant forum, not the Openhab forum.

Hi francisp, very sorry I should have explained. The advice for using the Modbus connection with Home Assistant (Nibe Heat Pump - Home Assistant) includes the use of the Openhab program at Nibe Heatpump - Bindings | openHAB.

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