From 831157188c6abd91bd63aa990a95ebc5edea2f18 Mon Sep 17 00:00:00 2001
From: Dominyk Tiller <dominyktiller@gmail.com>
Date: Sun, 31 Jul 2016 18:10:59 +0100
Subject: [PATCH] libgcrypt: add temporary Sierra build fix

---
 Formula/libgcrypt.rb | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Formula/libgcrypt.rb b/Formula/libgcrypt.rb
index b0fe461644..3bd1a1d7d7 100644
--- a/Formula/libgcrypt.rb
+++ b/Formula/libgcrypt.rb
@@ -25,6 +25,12 @@ class Libgcrypt < Formula
 
   def install
     ENV.universal_binary if build.universal?
+    # Temporary hack to get libgcrypt building on macOS 10.12.
+    # Seems to be a Clang issue rather than an upstream one, so
+    # keep checking whether or not this is necessary.
+    # Should be reported to GnuPG if still an issue when near stable.
+    # https://github.com/Homebrew/homebrew-core/issues/1957
+    ENV.O1 if MacOS.version >= :sierra
 
     system "./configure", "--disable-dependency-tracking",
                           "--disable-silent-rules",