On linux just use the system package tool to declare your dependencies. Yes, you may end up making a deb and an rpm but honestly, it's not an earth-shattering

On linux just use the system package tool to declare your dependencies. Yes, you may end up making a deb and an rpm but honestly, it's not an earth-shattering amount of work, lots of companies do it, and then the tool will tell the user "requires libjpeg".