title: LLVM and Clang installation: apt-get vs. manual install
body: <p><strong>apt-get method:</strong> I'm trying to install LLVM and Clang on Ubuntu 15.10. I used the commands <code>sudo apt-get install llvm</code> and <code>sudo apt-get install clang</code>. This seemed to have worked, and it only took a few minutes.</p>
  
  <p><strong>Manual method:</strong> However, most instructions online have me manually download and build the LLVM and Clang packages (e.g. see here: <a href="http://clang.llvm.org/get_started.html" rel="noreferrer">http://clang.llvm.org/get_started.html</a>). I understand this method could take some time, even a few hours for building LLVM and Clang.</p>
  
  <p>What's the difference between these two methods? Are they equivalent? I just want to make sure I have everything installed correctly. (My background is in Windows, so I'm missing the probably obvious difference.)</p>