From 3c6529851991eed20c75ba4661a1734d8a889468 Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Sat, 20 Aug 2016 16:45:02 +0100
Subject: [PATCH] build: permit weak imports in Go reverse deps.

Go makes extensive use of weak imports so we need to allow them when
building Go-using software.

Closes https://github.com/Homebrew/homebrew-core/issues/4047.
---
 Library/Homebrew/build.rb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Library/Homebrew/build.rb b/Library/Homebrew/build.rb
index 8915e948cc..e50d10b049 100644
--- a/Library/Homebrew/build.rb
+++ b/Library/Homebrew/build.rb
@@ -79,6 +79,11 @@ class Build
 
     ENV.activate_extensions!
 
+    # Go makes extensive use of weak imports.
+    if formula_deps.any? { |f| f.name == "go" }
+      ENV.permit_weak_imports
+    end
+
     if superenv?
       ENV.keg_only_deps = keg_only_deps
       ENV.deps = formula_deps