On 11/09/2020 12:09, Peter Williams wrote:
I decided to try it on a Linux Mint 20 Cinnamon machine with x86_64 processor I downloaded gpc-2.1-with-gcc.i686-pc-linux-gnu.tar.gz to  /home/peter/software and installed using:
That is a rather old version. Try https://launchpad.net/~ueter/+archive/ubuntu/gpc-3.4/+files/gpc-3.4_20070904...