There's no in-game instructions for building.
However, since you've been spending time in the desert, I'm sure you have plenty of torn muscles. Those things are pretty springy. Glue them to the bottom of a pair of boots, and you'll find that you can jump. Jump in the right place, and you'll find a rental store.
The churches are empty / The priest has gone home / And we are left standing / Together alone
--October Project: "Dark Time"