title: Error Compiling libc++ using Clang 3.0 on Ubuntu
body: <p>When I try to compile libc++ (<code>libcxx</code>) on my Ubuntu 12.04 with LLVM 3.0 and Clang 3.0 i get the error</p>
  
  <pre><code>+ clang++ -c -g -Os -fPIC -std=c++0x -fstrict-aliasing -Wall -Wextra -Wshadow -Wconversion -Wnewline-eof -Wpadded -Wmissing-prototypes -Wstrict-aliasing=2 -Wstrict-overflow=4 -nostdinc++ -I../include ../src/stdexcept.cpp
  ../src/stdexcept.cpp:18:10: fatal error: 'cxxabi.h' file not found
  #include &lt;cxxabi.h&gt;
           ^
  1 error generated.
  </code></pre>
  
  <p>Where should I put cxxabi.h? It's currently in the following places</p>
  
  <pre><code>/usr/include/c++/4.4/cxxabi.h
  /usr/include/c++/4.6/cxxabi.h
  /usr/include/c++/4.7/cxxabi.h
  </code></pre>