title: Exiftools not installing on Heroku
body: <p>I am trying to deploy my first project on Heroku and having an issue trying to install Exiftools on Heroku. My site is highly dependent on using <code>ExifField</code> within my models to get image information from pictures which is then displayed within my Django Admin to be edited etc. This all works fine locally in development.</p>
  <p><code>Exiffield</code> relies on Exiftool.exe to work, so I have to install a buildpack to Heroku which I have done, but it fails to see it during release when pushing to Heroku via CLI. All Django modules have installed OK.</p>
  <p>I have added <code>Procfile</code> , <code>requirements</code>, <code>runtime</code> and everything seems to go OK, it even states it's intalled Exiftool but fails on release. Log below. Any help would be greatly appreciated.</p>
  <p>I was thinking it was issue with Procfile but it seems correct.</p>
  <pre><code>release: python manage.py migrate
     web: gunicorn blog.wsgi
  </code></pre>
   
  <pre><code>Enumerating objects: 7, done.
  Counting objects: 100% (7/7), done.
  Delta compression using up to 16 threads
  Compressing objects: 100% (3/3), done.
  Writing objects: 100% (4/4), 375 bytes | 375.00 KiB/s, done.
  Total 4 (delta 1), reused 0 (delta 0), pack-reused 0
  remote: Compressing source files... done.
  remote: Building source:
  remote:
  remote: -----&gt; Building on the Heroku-20 stack
  remote: -----&gt; Using buildpacks:
  remote:        1. heroku/python
  remote:        2. https://github.com/benalavi/buildpack-exiftool
  remote: -----&gt; Python app detected
  remote: -----&gt; Using Python version specified in runtime.txt
  remote:  !     Python has released a security update! Please consider upgrading to python-3.9.10
  remote:        Learn More: https://devcenter.heroku.com/articles/python-runtimes
  remote: -----&gt; No change in requirements detected, installing from cache
  remote: -----&gt; Using cached install of python-3.9.0
  remote: -----&gt; Installing pip 21.3.1, setuptools 57.5.0 and wheel 0.37.0
  remote: -----&gt; Installing SQLite3
  remote: -----&gt; Installing requirements with pip
  remote: -----&gt; Skipping Django collectstatic since the env var DISABLE_COLLECTSTATIC is set.
  remote: -----&gt; exiftool app detected
  remote: -----&gt; Installing exiftool-9.40
  remote:        Setting PATH
  remote: -----&gt; Discovering process types
  remote:        Procfile declares types -&gt; release, web
  remote:
  remote: -----&gt; Compressing...
  remote:        Done: 80.4M
  remote: -----&gt; Launching...
  remote:  !     Release command declared: this new release will not be available until the command succeeds.
  remote:        Released v37
  remote:        https://********.herokuapp.com/ deployed to Heroku
  remote:
  remote: Verifying deploy... done.
  remote: Running release command...
  remote:
  remote: SystemCheckError: System check identified some issues:
  remote:
  remote: ERRORS:
  remote: myblog.Photo.exif: (exiffield.E001) `exiftool` not found.
  remote:         HINT: Please install `exiftool.`
  remote: Waiting for release... failed.
  To https://git.heroku.com/******.git
     7281f6e..bf1bc47  master -&gt; master
  </code></pre>