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In Manjaro you just run this command, there’s a GU package manager as well, but I’ve never used it. Pamac takes care of downloading / building any required dependencies and the AUR repo includes any required patches for the application run well on Arch / Manjaro.
pamac build
I haven’t used Arch in years, but I believe it was something similar.
The whole system is pretty similar to, (but more refined than) FreeBSDs Ports tree.
Security through obscurity would be having a system connected to a network, but relying on a secret / unknown protocol to secure it.
Air-gapping a system is a real and very useful security method. That being said, it’s not enough by itself.
If you’re interested, have a look at past examples, like the recent work on breaking Tetra communication standard and Stuxnet.