Based on https://github.com/millie/heroku-buildpack-ruby-pdftk, but modified for use with https://github.com/ddollar/heroku-buildpack-multi.
How to install:
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Download PDFTK source (compiled for Heroku's Cedar Stack) from http://github.com/millie/pdftk-source
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Upload the tar.gz to your own S3 bucket. Make it public. Remember the S3 URL of the tar.gz file.
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Clone this repo to your own.
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Update lib/custom/pdftk.rb source_url method to return the S3 URL from step 2.
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Add your cloned repo to your project's .buildpacks file.
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Add config vars to heroku like so
heroku config:set \
BUILDPACK_URL=https://github.com/ddollar/heroku-buildpack-multi.git \
PATH=[your current PATH var]:/app/vendor/pdftk/bin \
LD_LIBRARY_PATH=[your current LD_LIBRARY_PATH var (if you have set before)]:/app/vendor/pdftk/lib