Merge pull request #3699 from MikeMcQuaid/versions-should-build
docs/Versions: versions should build.
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				@ -7,6 +7,7 @@ In [homebrew/versions](https://github.com/homebrew/homebrew-versions) the formul
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## Acceptable versioned formulae
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Versioned formulae we include in [homebrew/core](https://github.com/homebrew/homebrew-core) must meet the following standards:
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* Versioned software should build on all Homebrew's supported versions of macOS.
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* Versioned formulae should differ in major/minor (not patch) versions from the current stable release. This is because patch versions indicate bug or security updates and we want to ensure you apply security updates.
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* Upstream should have a release branch for the versioned formulae version and still make security updates for that version, when necessary. For example, [PHP 5.5 was not a supported version but PHP 7.2 was](http://php.net/supported-versions.php) in January 2018
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* Formulae that depend on versioned formulae must not depend on the same formulae at two different versions twice in their recursive dependencies. For example, if you depend on `openssl@1.0` and `foo`, and `foo` depends on `openssl` then you must instead use `openssl`.
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