title: Bundle install, how to avoid using the library from source
body: <p>I want to install a library to my <code>rvm gemsets</code>, but this library is not available using in the <code>gem install</code>. I have to install it from source</p>
  
  <p>I do <code>bundle install</code> and it went well, except that It does not install the lib to the gemset but only the dependencies.</p>
  
  <p>And I notice in the log this line
  <code>Using xxx (a.b.c) from source at .</code></p>
  
  <p>xxx is the library itself with version a.b.c and I can only use the library when I am in the source folder.</p>
  
  <p>How to force to copy the library to the gemsets folder ?</p>