The formula needs to build and pass tests on the latest 3 supported macOS versions (x86_64 and Apple Silicon/ARM) and on x86_64 Linux. Please have a look at the continuous integration jobs on a pull request in
homebrew/core to see the full list of OSs. If upstream does not support one of these platforms, an exception can be made and the formula can be disabled for that platform.
We now accept stuff that comes with macOS as long as it uses
keg_only :provided_by_macos to be keg-only by default.
We now accept versioned formulae as long as they meet the requirements.
We will not add new formulae using forks unless at least one of the following is true:
The fork must still meet all the other acceptable formulae requirements (including those of e.g. popularity and self-submission).
An alternative to the fork replacing the original formula is a new formula. For example, if
curl and it was very popular: a
curl-mikemcquaid formula might make sense.
Software that can upgrade itself does not integrate well with Homebrew formulae’s own upgrade functionality. The self-update functionality should be disabled (while minimising complication to the formula). It’s fine (and well-supported) for Casks.
We don’t like install scripts that are pulling from the master branch of Git repositories or unversioned, unchecksummed tarballs. These should ideally use
resource blocks with specific revisions or checksummed tarballs instead. Note that we now allow tools like
pip to download versioned libraries during installation. There’s no need to reproduce the functionality of any language package manager with
resource blocks when we can call it instead.
Our policy is that formulae in the core tap (homebrew/core) must be open-source with a Debian Free Software Guidelines license and either built from source or producing cross-platform binaries (e.g. Java, Mono). Binary-only formulae should go in homebrew/cask.
Additionally, core formulae must also not depend on casks or any other proprietary software. This includes automatic installation of casks at runtime.
Formulae in the core repository must have a stable version tagged by the upstream project. Tarballs are preferred to Git checkouts, and tarballs should include the version in the filename whenever possible.
We don’t accept software without a tagged version because they regularly break due to upstream changes and we can’t provide bottles for them.
The software in question must:
We will reject formulae that seem too obscure, partly because they won’t get maintained and partly because we have to draw the line somewhere.
We frown on authors submitting their own work unless it is very popular.
Don’t forget Homebrew is all Git underneath! Maintain your own tap if you have to!
There may be exceptions to these rules in the main repository; we may include things that don’t meet these criteria or reject things that do. Please trust that we need to use our discretion based on our experience running a package manager.
Don’t make your formula build an
.app (native macOS Application); we don’t want those things in Homebrew. Encourage upstream projects to build and support a
.app that can be distributed by homebrew/cask (and used without it, too).
Make it build a command-line tool or a library by default and, if the GUI is useful and would be widely used, also build the GUI. Don’t build X11/XQuartz GUIs as they are a bad user experience on macOS.
Clang is the default C/C++ compiler on macOS (and has been for a long time). Software that doesn’t build with it hasn’t been adequately ported to macOS.
We’re a package manager so we want to do things like resolve dependencies and set up applications for our users. If things require too much manual intervention then they aren’t useful in a package manager.
In general, if formulae have to ship either shared or static libraries: they should ship shared ones. If there is interest in static libraries they can ship both. Shipping only static libraries should be avoided when possible, particularly when the formula is depended on by other formulae since these dependents cannot be updated without a rebuild.
Homebrew formulae should avoid having multiple, separate, upstream projects bundled together in a single package to avoid shipping outdated/insecure versions of software that is already a formula. Veracode’s State of Software Security report concludes:
In fact, 79% of the time, developers never update third-party libraries after including them in a codebase.
Increasingly, though: this can be (too) hard. Homebrew’s primary mission is to be useful rather than ideologically pure. If we cannot package something without using vendored upstream versions: so be it; better to have packaged software in Homebrew than not.
Even if all criteria are met we may not accept the formula. Even if some criteria are not met we may accept the formula. New formulae are held to a higher standard than existing formulae. Documentation will lag behind current decision-making. Although some rejections may seem arbitrary or strange they are based on years of experience making Homebrew work acceptably for our users.