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XCodeを4.5にバージョンアップした後に、gem(native extensions)のインストールで「You have to install development tools first.」と言われてしまった時の対処法

参考:http://stackoverflow.com/questions/10344821/gem-install-pg-doesnt-work-on-osx-lion

以下を実行して下さい。

sudo ln -s /usr/bin/llvm-gcc-4.2 /usr/bin/gcc-4.2

もしくは、

sudo ln -s /usr/bin/gcc /usr/bin/gcc-4.2

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