Ruby There currently is support to bundle applications that are packaged as Ruby gems. The utility "bundix" allows you to write a Gemfile, let bundler create a Gemfile.lock, and then convert this into a nix expression that contains all Gem dependencies automatically. For example, to package sensu, we did: Gemfile source 'https://rubygems.org' gem 'sensu' $ bundler package --path /tmp/vendor/bundle $ $(nix-build '' -A bundix)/bin/bundix $ cat > default.nix { lib, bundlerEnv, ruby }: bundlerEnv { name = "sensu-0.17.1"; inherit ruby; gemfile = ./Gemfile; lockfile = ./Gemfile.lock; gemset = ./gemset.nix; meta = with lib; { description = "A monitoring framework that aims to be simple, malleable, and scalable."; homepage = http://sensuapp.org/; license = with licenses; mit; maintainers = with maintainers; [ theuni ]; platforms = platforms.unix; }; }]]> Please check in the Gemfile, Gemfile.lock and the gemset.nix so future updates can be run easily.