This gem just include the DejaVu fonts, to be used with Prawn or anything else similar.
You can get more information about DejaVu in the DejaVu site
In your Gemfile
gem "dejavu-fonts"
In your Prawn object,
font_families.update("dejavu" => DejaVu::Fonts::Paths)
# ...
font("dejavu") do
# ...
end