Applies to Debian-based distros too.

1. Install build-essential and kernel source

   sudo apt install linux-source build-essential

2. Decompress kernel source

   cd /usr/src ;
   sudo tar -xf linux-source-5.10.tar.xz ;
   cd /usr/src/linux-source-5.10/tools/testing/selftests/ptp

3. Build!

   gcc -static testptp.c -o testptp

4. Optional - install

   mv testptp /usr/bin/.

5. Test!

   sudo testptp /dev/ptp0 -c