title: Error when brewing Qt 32 bits on OS X
body: <p>When trying to install Qt on OSX (10.11) via homebrew with the <code>--universal</code> option</p>
  
  <pre><code>brew install qt --universal
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>clang: error: invalid Xarch argument: '-Xarch_i386 -framework', options requiring arguments are unsupported
  clang: error: invalid Xarch argument: '-Xarch_i386 -framework', options requiring arguments are unsupported
  make[4]: *** [../../../../plugins/phonon_backend/libphonon_qt7.dylib] Error 1
  make[3]: *** [release] Error 2
  make[2]: *** [sub-qt7-make_default] Error 2
  make[1]: *** [sub-phonon-make_default] Error 2
  make: *** [sub-plugins-make_default-ordered] Error 2
  </code></pre>
  
  <p>Any idea on how to fix that?</p>