Ruby 2.0.0: An error occurred while installing binding_of_caller (

I recently updated two of the Rails apps I'm working with to use Ruby 2.0

When running bundle install I came across this error:

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /Users/Gavin/.rvm/rubies/ruby-2.0.0-p0/bin/ruby extconf.rb 
creating Makefile

compiling binding_of_caller.c
binding_of_caller.c:4:10: fatal error: 'vm_core.h' file not found
#include "vm_core.h"
1 error generated.
make: *** [binding_of_caller.o] Error 1

Gem files will remain installed in [email protected]/gems/binding_of_caller-0.6.8 for inspection.
Results logged to [email protected]/gems/binding_of_caller-0.6.8/ext/binding_of_caller/gem_make.out

An error occurred while installing binding_of_caller (0.6.8), and Bundler cannot
Make sure that `gem install binding_of_caller -v '0.6.8'` succeeds before bundling.

The problem, as mentioned in this thread on Github, is that 0.7.1 is the minimum version of binding_of_caller that supports Ruby 2.0.

I wasn't sure which of my apps gems were dependent on binding_of_caller 0.6.8 so I ran bundle update.

I also updated Rails from version 3.2.11 to 3.2.12

Problem solved

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