Crie um instalador Yosemite USB

sudo /Applications/Install OS X 10.10 Developer Preview.app/Contents/Resources/createinstallmedia –volume /Volumes/<YOUR USB DRIVE> –applicationpath /Applications/Install OS X 10.10 Developer Preview.app –nointeraction Basta substituir <YOUR USB DRIVE>pelo nome correto para sua unidade USB.

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Instalando a libv8 mais antiga no Yosemite

brew updatebrew uninstall v8brew install apple-gcc42ln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/gcc-4.2 /usr/local/bin/gccln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/g++-4.2 /usr/local/bin/g++ln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/cpp-4.2 /usr/local/bin/cppgem install libv8gem install therubyracerbrew uninstall apple-gcc42rm /usr/local/bin/gccrm /usr/local/bin/g++rm /usr/local/bin/cpp

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