How to make wkhtmltopdf work on Drupal
In addition to Yuri's answer, I wanted to provide more detail for how I solved this issue, where I couldn't resolve the following error:


  No PDF generation tool found! Please download a supported PHP PDF generation tool



install the print module
install pdf php handlers and libraries for your environment from https://wkhtmltopdf.org/downloads.html; see note
create symlink in sites/all/libraries/wkhtmltopdf to library in server; make sure symlink is executable to the server sudo chown -h [owner]and sudo chgrp -h [group]
install and enable phpwkhtmltopdf
run drush make --no-core -y sites/all/modules/contrib/phpwkhtmltopdf/phpwkhtmltopdf.make
enable print_pdf_wkhtmltopdf
set up and customize; see recommendations in this blog for more
info


Note: My local dev environment is on a Mac OS X so I had to download and run the package, then create a symlink to sites/all/libraries/wkhtmltopdffrom /usr/local/bin/wkhtmltopdf

Sources:


https://www.drupal.org/node/2430561
https://www.sitepoint.com/effective-pdf-generation-drupal/
https://wkhtmltopdf.org/downloads.html