That's a tool you have to download. It doesn't come with the OS.

lqdc13 · on Oct 29, 2016

And yet OSX doesn't have such a tool from an official or even unofficial source without a daemon running and wasting CPU cycles.

I bought a non-apple keyboard and still can't map home+end keys in all applications without a daemon running.

kalleboo · on Oct 29, 2016

Ukelele? I used to create a hybrid custom Swedish layout that shows up among all the system key layouts http://scripts.sil.org/ukelele