Our current install-dependencies script supports only Debian, Fedora, and Arch, and always seems to be missing something when I use it on Fedora. I also get tired of people adding dependencies for Debian only. jhbuild has a distro-agnostic sysdeps facility we should be using instead. It's more verbose, but it works everywhere and is a better user experience.
We have flatpak now, RIP jhbuild!