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Go to https://developer.apple.com/downloads/index.action and search for "Command line tools" and choose the one for your Mac OSX
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Go to http://brew.sh/ and enter the one-liner into the Terminal, you now have
brew
installed (a better Mac ports) -
Install transmission-daemon with
brew install transmission
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Copy the startup config for launchctl with
ln -sfv /usr/local/opt/transmission/*.plist ~/Library/LaunchAgents