title: Install libc++ on ubuntu
body: <p>I am wondering what is the right/easy way to install a binary libc++ on Ubuntu, in my case Trusty aka 14.04?</p>
  
  <p>On the LLVM web site there are apt packages <a href="http://apt.llvm.org/" rel="noreferrer">http://apt.llvm.org/</a> and I have used these to install 3.9. However these packages don't seem to include libc++. I install the libc++-dev package but that seems to be a really old version. There are also binaries that can be downloaded <a href="http://llvm.org/releases/download.html#3.9.0" rel="noreferrer">http://llvm.org/releases/download.html#3.9.0</a>. These do seem to contain libc++ but I'm not sure if I can just copy bits of this into places like /usr/include/c++/v1, in fact I'm not really sure what bits I would need to copy. I am aware I can use libc++ from an alternate location as documented here <a href="http://libcxx.llvm.org/docs/UsingLibcxx.html" rel="noreferrer">http://libcxx.llvm.org/docs/UsingLibcxx.html</a> which I have tried. However I can't modify the build system of the large code base I work on to do this.</p>
  
  <p>So is three any reason the apt packages don't include libc++ and any pointers to installing a binary would be gratefully recieved.</p>