Following the advice of Mastering Emacs I'm trying to use the project.el package. My problem is that C-x p isn't bound to the prefix keymap and I can't figure out how to bind it correctly.

I'm pretty sure I'm trying to get this part of the package to load: https://github.com/emacs-mirror/emacs/blob/master/lisp/progmodes/project.el#L618

I've tried this:

(use-package project :bind-keymap ("C-x p" . project-prefix-map)) 

but I get a Wrong type argument: sequencep

I've tried bind-key but I don't know what to put in for the COMMAND argument so I tried this:

(bind-key "C-x p" project-prefix-map) 

which is also wrong.

I'm running Emacs on MacOS. The Emacs version is GNU Emacs 27.1 (build 1, x86_64-apple-darwin19.6.0, NS appkit-1894.60 Version 10.15.7 (Build 19H15)) installed using macports.