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Install XQuartz
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Install meld with brew
brew install meld
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Copy PYTHONPATH
brew info pygtk
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Paste result of (3) in ~/.bashrc or ~/.zshrc
export PYTHONPATH=/usr/local/lib/python2.7/site-packages:$PYTHONPATH
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Set meld as your default git mergetool
git config --global merge.tool meld git config --global diff.external git-meld
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Go find your conflicts!
Source: Homebrew/legacy-homebrew#20644