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Upgraded one machine from Snow Leopard (10.6) and another from Lion (10.7). No issues what so ever. Both still work perfectly, all my stuff from HomeBrew transferred over without any issues either (which is fantastic, did not want to have to recompile all of that stuff).

The upgrade was fast and easy, definitely not something I expected and I had backed up my machine to do an install from scratch, but not required at all.

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Did you lose the XCode Command Line tools? I had to install them last week (after I had upgraded) and I swear on my life I had them before. (I would have had to have to have used brew and built as many of my projects as I had).

I did indeed lose those. It leaves your /usr/local intact, but removes your /usr/<everything else>.

Just re-installed them, all is well again.

Which is really as it should be. /usr/bin is typically considered to be the property of the OS.

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