$ pyenv virtualenv 3.6.5 pytesseract-server
$ pyenv activate pytesseract-server
$ make pip
$ make run-dev
Web 前端界面直接用了 otiai10/ocrserver
$ heroku buildpacks:add --index 1 https://github.com/heroku/heroku-buildpack-apt
$ heroku config:set TESSDATA_PREFIX=/app/.apt/usr/share/tesseract-ocr/tessdata
$ cat Aptfile
tesseract-ocr
libtesseract-dev