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I have a 2011 MBA (i5 1.7Ghz with 4GB RAM) running Lion 10.7.5. I'm tempted to do a Mavericks upgrade (in the particular hope of improving power and memory management), but since this is a development machine, with a ton of stuff installed with homebrew.

Can I upgrade to Mavericks without impacting my homebrew installation too much (or how can I recover/rebuild it easily if necessary)?

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Really? I understand your point, but I don't think that edit was quite necessary, as my questions were pretty much related and complementary. –  cjauvin Mar 21 at 18:16
Usually people here accept one answer at the end to show which answer helped them the most. If one answer covers the upgrade part of the question and another the 2nd question you asked, which one are you going to accept? Also, keeping questions focused increases their value in the long term. And you even might find an already available answer here to your second question (at least the topic has come up before). –  patrix Mar 21 at 18:21

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