Clone the project: git clone http://github.com/rtomayko/posix-spawn.git cd posix-spawn bundle install Rake tasks can be run without further setup: rake build rake test rake benchmark Just `rake' builds the extension and runs the tests. If you want to run the benchmark scripts or tests directly out of a working copy, first setup your PATH and RUBYLIB environment: PATH="$(pwd)/bin:$PATH" RUBYLIB="$(pwd)/lib:$(pwd)/ext:$RUBYLIB" export RUBYLIB Or, use the following rbdev script to quickly setup your PATH and RUBYLIB environment for this and other projects adhering to the Ruby Packaging Standard: https://github.com/rtomayko/dotfiles/blob/rtomayko/bin/rbdev