1 files changed, 2 insertions, 0 deletions
diff --git a/Library/Formula/gnupg.rb b/Library/Formula/gnupg.rb
index f42b3397f..b7341defe 100644
--- a/Library/Formula/gnupg.rb
+++ b/Library/Formula/gnupg.rb
@@ -24,6 +24,8 @@ class Gnupg < Formula
   end
 
   def install
+    ENV.append 'CFLAGS', '-std=gnu89' if ENV.compiler == :clang
+
     if ARGV.include? '--idea'
       opoo "You are building with support for the patented IDEA cipher."
       d=Pathname.getwd