I\'ve been using PDFTK Server on OSX pre 10.11 for over a year without any issues running commands on the command line.
PDFTK
OSX pre 10.11
After installing OS
Thanks to github.com/quantiverge, pdftk should be installable under brew. This one is tested in OSX Sierra.
Run the following in the terminal.
brew install https://raw.githubusercontent.com/turforlag/homebrew-cervezas/master/pdftk.rb
Updated with fixes from github.com/zph - thanks!