$ sudo apt-get install build-essential
$ sudo apt-get install golang
$ curl -sL https://deb.nodesource.com/setup_<Node.js version>.x | bash -; apt-get install nodejs
$ sudo apt-get install php-dev libphp-embed
$ sudo apt-get install libperl-dev
$ sudo apt-get install python-dev
$ sudo apt-get install ruby-dev
$ sudo apt-get install libssl-dev

$ git clone https://github.com/nginx/unit
$ cd unit
$ ./configure \
  --state=/var/lib/unit \
  --log=/var/log/unit.log \
  --control=unix:/run/control.unit.sock \
  --prefix=/usr/
$ ./configure php
$ sudo service unit restart
$ sudo curl -X PUT --data-binary @/usr/share/doc/unit-php/examples/unit.config --unix-socket /run/control.unit.sock http://localhost/config 
$ curl http://localhost:8300/

More info: https://unit.nginx.org/installation/#installing-required-software