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Now install wkhtmltoimage binaries:
Global: sudo `which imgkit` --install-wkhtmltoimage
        rvmsudo imgkit --install-wkhtmltoimage
(installs to default /usr/local/bin/wkhtmltoimage)

inside RVM folder: export TO=`which imgkit | sed 's:/imgkit:/wkhtmltoimage:'` && imgkit --install-wkhtmltoimage
(you'll have to configure the location of the binary if you do this!)

(run imgkit --help to see more options)
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