If you want to use
ft_extract function, it currently has
two options for how to extract text from PDFs: xpdf and ghostscript.
See http://www.foolabs.com/xpdf/download.html for instructions on how to download
and install 'xpdf'. For OSX, you an also get 'xpdf' via
Homebrew (https://github.com/homebrew/homebrew-x11/blob/master/xpdf.rb) with
brew install xpdf. Apparently, you can optionally install Poppler, which is
built on xpdf. Get it at http://poppler.freedesktop.org/
See http://www.ghostscript.com/doc/9.16/Install.htm for instructions on how to
download and install 'ghostscript'. For OSX, you an also get 'ghostscript' via
brew install gs
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