1 files changed, 7 insertions, 0 deletions
diff --git a/Library/Formula/ghc.rb b/Library/Formula/ghc.rb
index e07483b85..e34b934b8 100644
--- a/Library/Formula/ghc.rb
+++ b/Library/Formula/ghc.rb
@@ -44,6 +44,13 @@ class Ghc < Formula
     end
   end
 
+  fails_with :llvm do
+    cause <<-EOS.undent
+      cc1: error: unrecognized command line option "-Wno-invalid-pp-token"
+      cc1: error: unrecognized command line option "-Wno-unicode"
+    EOS
+  end
+
   if build.build_32_bit? || !MacOS.prefer_64_bit? || MacOS.version < :mavericks
     fails_with :clang do
       cause <<-EOS.undent