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Install apple-gcc42 by homebrew,

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brew tap homebrew/dupes
brew install apple-gcc42

if it is too slow, you can download it manually.

1. looking for Formula by http://braumeister.org/, or

find the url in ‘https://github.com/Homebrew/homebrew-dupes/blob/master/apple-gcc42.rb’, it is ‘http://r.research.att.com/tools/gcc-42-5666.3-darwin11.pkg’, version is ‘4.2.1-5666.3’, maybe not the lastest as time pass by.

1. puts this in /usr/local/Library/Caches/Homebrew/, run again.

ps: Sometimes it will appear errors like: ‘make: /usr/bin/gcc-4.2: No such file or directory’. The resolution is link apple-gcc42 to gcc-4.2

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

pps: if you run ‘brew install appe-gcc42’, it says counldn’t found any Formula named apple-gcc42

first, try brew tap homebrew/dupes, then run again.

seaond, download the ‘https://github.com/Homebrew/homebrew-dupes/blob/master/apple-gcc42.rb’, put it into /usr/local/Library/Formula/, then try again

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