From a7e330473545596abf2ec95b8214dda1ff98d5ef Mon Sep 17 00:00:00 2001
From: Gabriel <ggkpacker@gmail.com>
Date: Wed, 22 May 2019 14:10:28 -0300
Subject: [PATCH] Extends Formula class with mac os #uses_from_macos

---
 Library/Homebrew/extend/os/formula.rb     |  3 +++
 Library/Homebrew/extend/os/mac/formula.rb | 19 +++++++++++++++++++
 Library/Homebrew/formula.rb               |  2 ++
 3 files changed, 24 insertions(+)
 create mode 100644 Library/Homebrew/extend/os/formula.rb
 create mode 100644 Library/Homebrew/extend/os/mac/formula.rb

diff --git a/Library/Homebrew/extend/os/formula.rb b/Library/Homebrew/extend/os/formula.rb
new file mode 100644
index 0000000000..f1aadd7832
--- /dev/null
+++ b/Library/Homebrew/extend/os/formula.rb
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+require "extend/os/mac/formula" if OS.mac?
diff --git a/Library/Homebrew/extend/os/mac/formula.rb b/Library/Homebrew/extend/os/mac/formula.rb
new file mode 100644
index 0000000000..b32dba6477
--- /dev/null
+++ b/Library/Homebrew/extend/os/mac/formula.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class Formula
+  class << self
+    def uses_from_macos(dep, **args)
+      depends_on(dep) if add_mac_dependency?(args)
+    end
+
+    private
+
+    def add_mac_dependency?(args)
+      args.each { |key, version| args[key] = OS::Mac::Version.from_symbol(version) }
+
+      args.blank? ||
+        args[:before] && OS::Mac.version < args[:before] ||
+        args[:after] && OS::Mac.version >= args[:after]
+    end
+  end
+end
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index ab4dc62fe1..2c7b3261fd 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -2566,3 +2566,5 @@ class Formula
     end
   end
 end
+
+require "extend/os/formula"