You might run into an issue compiling the kdtree gem's native extensions on your machine. The error might look a bit like the following:
X-MacBook-Pro:Pitot X$ sudo gem install kdtree
Building native extensions. This could take a while...
ERROR: Error installing kdtree:
ERROR: Failed to build gem native extension.
/Users/X/.rvm/rubies/ruby-1.9.3-p327/bin/ruby extconf.rb
creating Makefile
make
compiling kdtree.c
In file included from /Users/X/.rvm/rubies/ruby-1.9.3-p327/include/ruby-1.9.1/ruby.h:32,
from kdtree.c:1:
/Users/X/.rvm/rubies/ruby-1.9.3-p327/include/ruby-1.9.1/ruby/ruby.h:48:21: error: string.h: No such file or directory
/Users/X/.rvm/rubies/ruby-1.9.3-p327/include/ruby-1.9.1/ruby/ruby.h:58:21: error: stdint.h: No such file or directory
/Users/X/.rvm/rubies/ruby-1.9.3-p327/include/ruby-1.9.1/ruby/ruby.h:61:23: error: inttypes.h: No such file or directory
/Users/X/.rvm/rubies/ruby-1.9.3-p327/include/ruby-1.9.1/ruby/ruby.h:65:19: error: stdio.h: No such file or directory
<snip>
This can be fixed by running:
xcode-select --install
And then running:
sudo gem install kdtree
Before running bundler.
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