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heroku-diff-pdf-buildpack

For use in a multi buildpack:

  1. Configure heroku for multiple build packs.
heroku config:set BUILDPACK_URL=https://github.com/polarsteps/heroku-diff-pdf-buildpack.git
  1. Add pdftk to .buildpacks file
echo "https://github.com/polarsteps/heroku-diff-pdf-buildpack.git" >> .buildpacks

Compilation/deploy notes

The minimum possible list of packages required to compile diff-pdf on Ubuntu are mentioned upstream.

Compile the binary using heroku/heroku:22 docker image. Pull the diff-pdf binary and move it to the binaries/ directory.

Once the app is deployed using the diff-pdf buildpack, there might still be some libraries that don't get installed. Find them out with ldd /path/to/diff-pdf on a running Heroku instance, and add these packages to the PACKAGES list.