gem install on bundle folder (vendor/bundle)

I am trying to install a ruby project, which has a dependency like in Gemfile ``` nokogiri (1.6.1) ``` bundlr fails ``` An error occurred while installing nokogiri (1.6.1), and Bundler cannot continue. Make sure that `gem install nokogiri -v '1.6.1'` succeeds before bundling. ``` I followed the instructions to install nokogiri manually and succeeded (OSX 10.9.2) ``` which nokogiri /usr/bin/nokogiri nokogiri Nokogiri: an HTML, XML, SAX, and Reader parser Usage: nokogiri <uri|path> [options] ... ``` but, how can I install nokogiri to the expected path by the app (vendor/bundle , like the other dependencies, not in system folder). I tried an option `--path vendor/bundle` with `gem install`, but it is not recognized ``` ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory. ``` I am running gem install as another user, that is why no permission to write to system folder. still, it is not trying to install at `vendor/bundle`. It is also ok if I can find a way to use bundle (instead of gem) to install nokogiri. But, I am not sure how to specify the dependencies like the installation command below. ``` gem install nokogiri -- --with-xml2-include=/usr/local/Cellar/libxml2/2.7.8/include/libxml2 --with-xml2-lib=/usr/local/Cellar/libxml2/2.7.8/lib --with-xslt-dir=/usr/local/Cellar/libxslt/1.1.26 --with-iconv-include=/usr/local/Cellar/libiconv/1.13.1/include --with-iconv-lib=/usr/local/Cellar/libiconv/1.13.1/lib ```