I'm having issues using TAB for indentation when viewing a Snakefile in emacs with snakemake-mode.

When I open a Snakefile in emacs, the syntax highlighting looks correct, but if try to use TAB for indentation, the cursor stays in column 0 and instead I get the error :
Symbol's function definition is void: looking-at-p

Followed directions here:
http://melpa.org/#/snakemake-mode

My setup:

• GNU Emacs 22.1.1
• snakemake-mode commit SHA 295bbfb
• file snakemake-mode.el in my ~/.emacs.d
• In my ~/.emacs :

(add-to-list 'load-path "~/.emacs.d/")
(require 'snakemake-mode)

• Also tried in my ~/.emacs :

(load-file "~/.emacs.d/snakemake-mode.el")

Next I'll try installing from MELPA but i thought this should be documented somewhere. Of course, any insight appreciated.

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