gistfile1.txt

$ bundle -v
Bundler version 1.2.3

$ ls
Gemfile-special

$ cat Gemfile-special
source :rubygems

gem 'rake'

$ bundle install --gemfile=Gemfile-special --binstubs
Fetching gem metadata from http://rubygems.org/..
Using rake (10.0.3) 
Using bundler (1.2.3) 
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.

$ BUNDLE_GEMFILE=Gemfile-special bundle install --binstubs
Using rake (10.0.3) 

ArgumentError: different prefix: "" and "/Users/mscottford/src/bundler/testcases/i1131/bin"
An error occurred while installing rake (10.0.3), and Bundler cannot continue.
Make sure that `gem install rake -v '10.0.3'` succeeds before bundling.

$ BUNDLE_GEMFILE=/Users/mscottford/src/bundler/testcases/i1131/Gemfile-special bundle install --binstubs
Using rake (10.0.3) 
Using bundler (1.2.3) 
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.