I don't have the package builder
right now. So I just made the shared object file.
If you know how to copy the shared object file into your opencpn
lib folder you can download the buster compatible version here:
Copy libvdr_pi.so to the same folder as all the other opencpn plugins .so files are found. Usually it is /usr/lib/opencpn You know it is the right folder if it also has libgrib_pi.so or libchartdldr_pi.so there.