I'm trying to install php-mode, but I keep encountering this error when I run
Symbol's function definition is void: cl-macroexpand-all
The error persists whether I install php-mode via MELPA or manually.
Environment: Emacs 188.8.131.52 (x86_64-apple-darwin13.4.0, NS apple-appkit-1265.21) of 2014-10-04 on builder10-9.porkrind.org
Why won't php-mode run? Note: I'm relatively new to Emacs, and inexperienced.