socket: Address family not supported by protocol

[Leandro Bucci via Xenomai]

Hello to all. I have installed xenomai 3.1 on the raspberry pi4.
The latency and cyclictest examples work great. But examples like
iddp-label and xddp-echo don't work.
I get this error:
socket: Address family not supported by protocol
how can i solve this problem? maybe i need to load the related kernel
modules? If yes, how do you do it? sorry but I'm a beginner.