Problems updating therubyracer gem in Yosemite

I decided to run a bundle update on one of my core projects today and lo and behold, I received the following error:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

 /Users/kelvin/.rbenv/versions/2.2.0/bin/ruby -r ./siteconf20150415-9556-1l623l4.rb extconf.rb 
checking for main() in -lpthread... yes
checking for main() in -lobjc... yes
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling accessor.cc
clang: warning: argument unused during compilation: '-rdynamic'
In file included from accessor.cc:1:
In file included from ./rr.h:6:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/vector:265:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/__bit_reference:15:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/algorithm:628:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:604:
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/iterator:341:10: fatal error: '__debug' file not found
#include <__debug>
 ^
1 error generated.
make: *** [accessor.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/kelvin/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/therubyracer-0.12.2 for inspection.
Results logged to /Users/kelvin/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-14/2.2.0-static/therubyracer-0.12.2/gem_make.out
An error occurred while installing therubyracer (0.12.2), and Bundler cannot continue.
Make sure that `gem install therubyracer -v '0.12.2'` succeeds before bundling.

It turns out that there is an issue with the command line tools in Xcode 6.3. So you have to revert back to Xcode 6.2. For a full reference, here’s the link from StackOverflow where I got my information from.

Unfortunately, there’s not an easy way to directly link to the download but here’s the link to the general Developer Downloads from Apple