How to add a nixpkgs PR into your nixOS config manually?

[FliegendeWurst]

The thread linked below is about (roughly) the same topic. I think my answer (using applyPatches) would be the easiest approach in this case.

How to update only a single app?

Another option is the applyPatches function of nixpkgs: Nixpkgs/Patching Nixpkgs - NixOS Wiki It saves you the trouble of figuring out the right override invocation (just give it the upgrade PR as patch), at the cost of writing another nixpkgs tree to the store. (And longer eval time.)