Download all gems dependencies

I want to install compass by downloading any required file and taking them to another machine without internet connection. I have downloaded the source package for compass and when I run gem on it in the non connected machine it complains about missing dependencies. Any solution?

That's precisely the problem I had.

After searching around for a while I found a solution that works using Bundler https://bundler.io/

Getting Gem with Dependencies:

• Create a new Folder with a File named Gemfile.
• Write a Source and the Gem you want to have the dependencies for into the File
• Example:

  source "http://rubygems.org"
  gem 'rails', '3.2.1'

• Open a Commandline at this Folder and Execute: bundle install
• This should download and install all dependencies
• Execute the Command bundle list if you wanna see it
• Execute the Command bundle package
• This should create the Directory Structure vendor/cache
• Inside the cache directory are now all the dependencies you need for your gem

Install Gem on Machine without internet connection:

• Copy the cache Folder to the Machine
• Open a Commandline inside the Cache Folder and execute gem install --local Gemname.gem
• Example:

gem install --local rails-3.2.1.gem