Compile Warnings

[sshaw]

Compiling file /Users/sshaw/.emacs.d/.cask/24.4.1/elpa/ox-reveal-20161027.226/ox-reveal.el at Sat Feb  4 21:46:23 2017
ox-reveal.el:36:1:Warning: cl package required at runtime

In org-reveal-scripts:
ox-reveal.el:694:46:Warning: reference to free variable `client-multiplex'

In org-reveal-parse-token:
ox-reveal.el:745:6:Warning: `format' called with 2 args to fill 1 format
    field(s)

In org-reveal-format-list-item:
ox-reveal.el:766:28:Warning: org-html-checkbox called with 2 arguments, but
    accepts only 1

In org-reveal-plain-list:
ox-reveal.el:907:26:Warning: reference to free variable
    `org-html-checkbox-type'

In org-reveal-export-to-html:
ox-reveal.el:1156:14:Warning: assignment to free variable `retfile'
ox-reveal.el:1156:12:Warning: reference to free variable `retfile'

In end of data:
ox-reveal.el:1193:1:Warning: the function `org-export-get-reference' is not
    known to be defined.

[yjwen]

That was a known old API compatibility problem between different version of org-mode. Upgrade to the latest org-mode and org-reveal should fix that problem.