On my laptop running Fedora, the build was crashing hard when running the Perl script, with an error like `exec: -t: invalid option`.

After diving into the install scripts, I figured out it was caused by a block of code using `exec $XTERM` etc. The `$XTERM` was empty (I think), causing the problems. The block of code was guarded with a check on `$DISPLAY`, so unsetting that avoids it. The goal is to spawn a terminal for whatever reason, but you don't need it to complete the installation.