From c32865011d1536eb6f7e626a3cb389d35beda48a Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Fri, 9 Feb 2018 19:37:15 +0000
Subject: [PATCH] xcode_requirement: handle nil @version.

When the Xcode requirement doesn't specify a version then we need to
guard this check.
---
 Library/Homebrew/requirements/xcode_requirement.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/requirements/xcode_requirement.rb b/Library/Homebrew/requirements/xcode_requirement.rb
index 9396b0df72..6cb7d45d73 100644
--- a/Library/Homebrew/requirements/xcode_requirement.rb
+++ b/Library/Homebrew/requirements/xcode_requirement.rb
@@ -22,7 +22,7 @@ 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 Version.new(MacOS::Xcode.latest_version) < Version.new(@version)
+    if @version && 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.