Jekyll

Debian 6/squeeze

apt-get install ruby rubygems

# default install is to:
#     - /var/lib/gems/1.8

# another good choice is
#     - /home/$USER/.gem/ruby/1.8


# install in specific dir
gem install --install-dir ~/.gem/ruby/1.8

Add the install-dir to $PATH or start jekyll from where it is installed (here it is in /.gem/ruby/1.8/bin).