apt install \
libxml2-dev libxslt-dev libfreetype6-dev libjpeg-dev libz-dev libyaml-dev \
libcairo-dev gir1.2-pango-1.0 libgirepository1.0-dev libacl1-dev libssl-dev \
build-essential python3-gdbm python3-dev python3-pip python3-virtualenv virtualenv git
apt install tesseract-ocr libtesseract-dev libleptonica-dev
# Web server option 1: NGINX and uWSGI
apt install nginx uwsgi uwsgi-plugin-python3
# Web server option 2: Apache with ``mod_wsgi``
apt install apache2 libapache2-mod-wsgi
# Caching backend: Redis
apt install redis-server
# Database server: PostgreSQL
apt install postgresql postgresql-contrib
# SMTP server
apt install exim4