gistfile1.sh

$ cat Gemfile
source 'http://rubygems.org'

gem 'chef'
gem 'berkshelf'
gem 'knife-solo', :github => 'matschaffer/knife-solo'
$ bundle install
Updating git://github.com/matschaffer/knife-solo.git
Fetching gem metadata from http://rubygems.org/........
Fetching gem metadata from http://rubygems.org/..
Resolving dependencies...
Bundler could not find compatible versions for gem "json":
  In Gemfile:
    knife-solo (>= 0) ruby depends on
      json (<= 1.6.1, >= 1.4.4) ruby

    berkshelf (>= 0) ruby depends on
      json (1.8.0)

gistfile2.sh

$ cat Gemfile
source 'http://rubygems.org'

gem 'chef'
gem 'berkshelf'
gem 'knife-solo'
$ bundle install
Fetching gem metadata from http://rubygems.org/........
Fetching gem metadata from http://rubygems.org/..
Resolving dependencies...
Bundler could not find compatible versions for gem "json":
  In Gemfile:
    knife-solo (>= 0) ruby depends on
      json (<= 1.6.1, >= 1.4.4) ruby

    berkshelf (>= 0) ruby depends on
      json (1.8.0)

Bundler could not find compatible versions for gem "net-ssh":
  In Gemfile:
    knife-solo (>= 0) ruby depends on
      net-ssh (~> 2.1.3) ruby

    berkshelf (>= 0) ruby depends on
      net-ssh (2.6.8)