gistfile1.rb

Installing thor (0.18.1)
Installing bourbon (3.1.8)
Installing bcrypt-ruby (3.1.2)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /Users/chiragpatel/.rvm/rubies/ruby-1.9.3-p448/bin/ruby extconf.rb
checking for ruby/util.h... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
	--with-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib