<p>Trying to build mlpack with OpenMP support on MacOS X (10.11.6) led me to using <a href="http://www.llvm.org">llvm</a>'s clang (installed via <a href="http://brew.sh">Homebrew</a> ). With appropriate <code>cmake</code> command that almost worked:</p>

<pre><code>LDFLAGS=-L/usr/local/opt/llvm/lib CFLAGS=-I/usr/local/opt/llvm/include CPPFLAGS=-I/usr/local/opt/llvm/include\ -std=c++0x cmake -D CMAKE_C_COMPILER=clang-omp -D CMAKE_CXX_COMPILER=clang-omp++ ../
</code></pre>

<p>(<code>clang-omp</code> and <code>clang-omp++</code> are symlinks to llvm's binaries).</p>

<p>However, there was an error referring to <code>target_compile_features</code> directive in <code>CMake/NewCXX11.cmake</code> file:</p>

<pre><code>CMake Error at CMake/NewCXX11.cmake:4 (target_compile_features):
  target_compile_features no known features for CXX compiler

  "Clang"

  version 3.8.1.
</code></pre>

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