Add minimum OS X version requirement

Closes Homebrew/homebrew#19998.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/Library/Homebrew/requirements/macos_requirement.rb b/Library/Homebrew/requirements/macos_requirement.rb
new file mode 100644
index 000000000..c172189ee
--- /dev/null
+++ b/Library/Homebrew/requirements/macos_requirement.rb
@@ -0,0 +1,16 @@
+require 'requirement'
+
+class MinimumMacOSRequirement < Requirement
+  fatal true
+
+  def initialize(tags)
+    @version = MacOS::Version.from_symbol(tags.first)
+    super
+  end
+
+  satisfy { MacOS.version >= @version }
+
+  def message
+    "OS X #{@version.pretty_name} or newer is required."
+  end
+end