From 3c77faeb14886c30f8440c29101c6944aaf0bbdb Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Thu, 24 Nov 2016 08:54:24 +0000
Subject: [PATCH] exceptions: better handle unsupported macOS versions.
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Don’t fail on `OS::ISSUES_URL` being missing (which happens on
unsupported macOS versions) and instead tell people to not file issues.
---
 Library/Homebrew/exceptions.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 3d9b24034f..c2b78f8787 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -356,7 +356,7 @@ class BuildError < RuntimeError
       return
     end
 
-    if formula.tap
+    if formula.tap && defined?(OS::ISSUES_URL)
       if formula.tap.official?
         puts Formatter.error(Formatter.url(OS::ISSUES_URL), label: "READ THIS")
       elsif issues_url = formula.tap.issues_url