[chef] library gem dependencies

[Sam Darwin < >]

Let's say a cookbook library requires a gem called treetop (it could be any 
gem
actually), and so it has this line:

require 'treetop'

I want to get that installed as a pre-requisite, and so I add this code into
the default recipe:

r = chef_gem "treetop" do
  action :nothing
end
r.run_action(:install)

But apparently it won't get called soon enough.    The library has errors 
about
treetop missing.

As another attempt, I create a different cookbook called pre-requisites.  I 
add
the code "r = chef_gem "treetop" do"  into the pre-requisites cookbook, and
have that as a cookbook dependency.   Nope.   This also doesn't get called 
soon
enough.   treetop is missing.     Installing the treetop gem by hand will fix
it.      

The issue seems to be with a library and not with a recipe file, that is the
twist.