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Nice, clear explanation (as clear as it seems anything involving M4 can be) of this process, which I've used a lot but not thought about that much.
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Loads .env into ENV – a simpler alternative, perhaps, to Foreman, for certain tasks.
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"Since I’m an OS X user, I decided to make the whole thing work on my system – Leopard 10.5.6 at the time of this writing. Here are the notes, mostly for my reference and because it might be also useful to others:" God yes; setting up cairo on my Mac proved a nightmare last year.