need to compile program that accesses parallel port on 64-bit kernel

I have a program that was compiled on an old 32-bit kernel, and was run with libc6-i386 library. I can't figure out what I need to change to get it to compile on Ubuntu 20.04. I have attached the entire c program source.

Thanks in advance for any hints. (I compile with cc -o progsst progsst.c) Attached file is progsst.txt

Jon
Attached Files

progsst.txt (8.6 KB)