Hi Cas-
I forked garglk and built a script to enable RPM packaging for Fedora 29/30/31 distributions. My recent attempts to install the older gargoyle-2015-5.4.x86_64.rpm on modern Fedora operating systems resulted in errors which prompted me to do this work. I will make a pull request to your repo so you can incorporate the script if you like. I have prepared a test RPM package and it is available at the link below. I should point out that this package has SDL disabled as it was causing problems getting the build completed. Hopefully this can be resolved in a future build.