[chef] cookbook lib requiring gem

[Andreas Kollegger < >]

Hi,

What's the appropriate way to require a non-standard gem for a cookbook's 
library? I'm adding a zip.rb library to my cookbook, but it requires 
'archive/zip' to do the actual work. 

Should manually installing that gem be a pre-requisite,  or is there a clever 
way to bootstrap it with the gem_package resource in the recipe that uses it? 

Or, is relying on extra gems frowned upon?

Thanks for any hints,
Andreas