From 1373441e53d838264c70690e9612009f0e9735d8 Mon Sep 17 00:00:00 2001
From: Mike McQuaid
Date: Sun, 28 Jan 2018 19:08:19 +0000
Subject: xcode_requirement: inform users of macOS upgrade.

If you need a newer Xcode than the latest version provided by your
version of macOS then you need to upgrade your OS to install the
software.
---
 Library/Homebrew/requirements/xcode_requirement.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'Library')

diff --git a/Library/Homebrew/requirements/xcode_requirement.rb b/Library/Homebrew/requirements/xcode_requirement.rb
index a5f078c62..9396b0df7 100644
--- a/Library/Homebrew/requirements/xcode_requirement.rb
+++ b/Library/Homebrew/requirements/xcode_requirement.rb
@@ -22,7 +22,12 @@ class XcodeRequirement < Requirement
       A full installation of Xcode.app#{version} is required to compile this software.
       Installing just the Command Line Tools is not sufficient.
     EOS
-    if MacOS.version >= :lion
+    if Version.new(MacOS::Xcode.latest_version) < Version.new(@version)
+      message + <<~EOS
+        Xcode#{version} cannot be installed on macOS #{MacOS.version}.
+        You must upgrade your version of macOS.
+      EOS
+    elsif MacOS.version >= :lion
       message + <<~EOS
         Xcode can be installed from the App Store.
       EOS
-- 
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