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docs: talk about custom Requirements

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Jonathan Chang 2020-09-08 23:39:16 +10:00
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docs/Building-Against-Non-Homebrew-Dependencies.md
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@ -8,4 +8,4 @@ As Homebrew became primarily a binary package manager, most users were fulfillin
## Today
If you wish to build against custom non-Homebrew dependencies that are provided by Homebrew (e.g. a non-Homebrew, non-macOS `ruby`) then you must [create and maintain your own tap](How-to-Create-and-Maintain-a-Tap.md) as these formulae will not be accepted in Homebrew/homebrew-core. Once you have done that you can specify `env :std` in the formula which will allow e.g. `which ruby` to access your existing `PATH` variable and allow compilation to link against this Ruby.
If you wish to build against custom non-Homebrew dependencies that are provided by Homebrew (e.g. a non-Homebrew, non-macOS `ruby`) then you must [create and maintain your own tap](How-to-Create-and-Maintain-a-Tap.md) as these formulae will not be accepted in Homebrew/homebrew-core. Once you have done that you can specify `env :std` in the formula which will allow e.g. `which ruby` to access your existing `PATH` variable and allow compilation to link against this Ruby. You can also [include a custom Requirement](https://github.com/Homebrew/brew/tree/HEAD/Library/Homebrew/requirements) in your formula that more accurately describes the non-Homebrew software you build against.