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Formula Cookbook: /environmental/environment/

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Closes Homebrew/homebrew#50146.

Signed-off-by: Alex Dunn <adunn@ucsb.edu>
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Alex Dunn 2016-03-16 10:02:29 -07:00 committed by Xu Cheng
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10
share/doc/homebrew/Formula-Cookbook.md
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@ -104,7 +104,15 @@ We generally try to not duplicate system libraries and complicated tools in core
One very special exception is OpenSSL. Anything that uses OpenSSL *should* be built using Homebrew’s shipped OpenSSL and our test bot's post-install `audit` will warn if it detects you haven't done this.
Homebrew’s OpenSSL is [`keg_only`](http://www.rubydoc.info/github/Homebrew/homebrew/master/Formula#keg_only-class_method) to avoid conflicting with the system so sometimes formulae need to have environmental variables set or special configuration flags passed to locate our OpenSSL. You can see this mechanism in the [clamav](https://github.com/Homebrew/homebrew/blob/master/Library/Formula/clamav.rb#L28) formula. Usually this is unnecessary because when OpenSSL is specified as a dependency Homebrew temporarily prepends the `$PATH` with that prefix.
Homebrew’s OpenSSL is
[`keg_only`](http://www.rubydoc.info/github/Homebrew/homebrew/master/Formula#keg_only-class_method)
to avoid conflicting with the system so sometimes formulae need to
have environment variables set or special configuration flags passed
to locate our OpenSSL. You can see this mechanism in the
[clamav](https://github.com/Homebrew/homebrew/blob/master/Library/Formula/clamav.rb#L28)
formula. Usually this is unnecessary because when OpenSSL is specified
as a dependency Homebrew temporarily prepends the `$PATH` with that
prefix.
Homebrew maintains a special [tap that provides other useful system duplicates](https://github.com/Homebrew/homebrew-dupes).