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depends_on

depends_on is used to declare dependencies and requirements for a Cask. depends_on is not consulted until install is attempted.

depends_on cask:

The value should be another Cask token, needed by the current Cask.

Example use: SSHFS depends on OSXFUSE:

depends_on cask: 'osxfuse'

depends_on formula:

The value should name a Homebrew Formula needed by the Cask.

Example use: some distributions are contained in archive formats such as 7z which are not supported by stock Apple tools. For these cases, a more capable archive reader may be pulled in at install time by declaring a dependency on the Homebrew Formula unar:

depends_on formula: 'unar'

depends_on macos:

Requiring an Exact macOS Release

The value for depends_on macos: may be a symbol, string, or an array, listing the exact compatible macOS releases.

The available values for macOS releases are:

symbol corresponding string
:cheetah '10.0'
:puma '10.1'
:jaguar '10.2'
:panther '10.3'
:tiger '10.4'
:leopard '10.5'
:snow_leopard '10.6'
:lion '10.7'
:mountain_lion '10.8'
:mavericks '10.9'
:yosemite '10.10'
:el_capitan '10.11'
:sierra '10.12'
:high_sierra '10.13'
:mojave '10.14'

Only major releases are covered (version numbers containing a single dot). The symbol form is preferred for readability. The following are all valid ways to enumerate the exact macOS release requirements for a Cask:

depends_on macos: :yosemite
depends_on macos: [:mavericks, :yosemite]
depends_on macos: '10.9'
depends_on macos: ['10.9', '10.10']

Setting a Minimum macOS Release

depends_on macos: can also accept a string starting with a comparison operator such as >=, followed by an macOS release in the form above. The following are both valid expressions meaning “at least macOS 10.9”:

depends_on macos: '>= :mavericks'
depends_on macos: '>= 10.9'

A comparison expression cannot be combined with any other form of depends_on macos:.

depends_on arch:

The value for depends_on arch: may be a symbol or an array of symbols, listing the hardware compatibility requirements for a Cask. The requirement is satisfied at install time if any one of multiple arch: value matches the user’s hardware.

The available symbols for hardware are:

symbol meaning
:x86_64 64-bit Intel
:intel 64-bit Intel

The following are all valid expressions:

depends_on arch: :intel
depends_on arch: :x86_64            # same meaning as above
depends_on arch: [:x86_64]          # same meaning as above

Since as of now all the macOS versions we support only run on 64-bit Intel, depends_on arch: is never necessary.

All depends_on Keys

key description
formula: a Homebrew Formula
cask: a Cask token
macos: a symbol, string, array, or comparison expression defining macOS release requirements
arch: a symbol or array defining hardware requirements
x11: a Boolean indicating a dependency on X11
java: stub - not yet functional