diff --git a/Formula/qt.rb b/Formula/qt.rb
index cdbaf7a031..8ccc0522d6 100644
--- a/Formula/qt.rb
+++ b/Formula/qt.rb
@@ -38,10 +38,12 @@ class Qt < Formula
   def install
     ENV.append "CXXFLAGS", "-fvisibility=hidden"
     args = ["-prefix", prefix,
-            "-system-zlib", "-no-pch",
+            "-system-zlib",
             "-confirm-license", "-opensource",
             "-cocoa", "-fast" ]
 
+    args << "-platform" << "unsupported/macx-clang" if ENV.compiler == :clang
+
     # See: https://github.com/mxcl/homebrew/issues/issue/744
     args << "-system-sqlite" if MacOS.version == :leopard