title: llvm clang installation fails
body: <p>I am on CentOS 7.</p>
  
  <p>I used SVN to download the sources. Clang version is 4.0 and LLVM is 3.9.0</p>
  
  <p>After I run the "make" command, the "make install" gives the following error:</p>
  
  <pre><code>-- Up-to-date: /usr/local/lib/libclangSerialization.a
  -- Up-to-date: /usr/local/lib/libclangFrontend.a
  -- Up-to-date: /usr/local/lib/libclangRewriteFrontend.a
  -- Up-to-date: /usr/local/lib/libclangFrontendTool.a
  -- Up-to-date: /usr/local/lib/libclangTooling.a
  -- Up-to-date: /usr/local/lib/libclangToolingCore.a
  -- Up-to-date: /usr/local/lib/libclangIndex.a
  -- Up-to-date: /usr/local/lib/libclangStaticAnalyzerCore.a
  -- Up-to-date: /usr/local/lib/libclangStaticAnalyzerCheckers.a
  -- Up-to-date: /usr/local/lib/libclangStaticAnalyzerFrontend.a
  -- Up-to-date: /usr/local/lib/libclangFormat.a
  -- Up-to-date: /usr/local/bin/clang-4.0
  CMake Error at tools/clang/tools/driver/cmake_install.cmake:36 (file):
    file INSTALL cannot find "/home/user_dir/src/llvm/build/bin/clang".
  Call Stack (most recent call first):
    tools/clang/tools/cmake_install.cmake:38 (include)
    tools/clang/cmake_install.cmake:51 (include)
    tools/cmake_install.cmake:43 (include)
    cmake_install.cmake:62 (include)
  </code></pre>
  
  <p>It seems the make command can not build the clang executable. How to fix this?</p>
  
  <p>I am following this "Getting started": <a href="http://clang.llvm.org/get_started.html" rel="nofollow">http://clang.llvm.org/get_started.html</a></p>