title: What is cmake_install.cmake
body: <p>I wrote a very simple HelloWorld.c program and ran Cmake. It created a <code>cmake_install.cmake</code> file in my build directory. Can somebody explain to me why CMake generated the file cmake_install.cmake?  What is it's purpose and how can I use it?</p>
  
  <p>CMakelists.txt :</p>
  
  <pre><code>cmake_minimum_required(VERSION 3.0)
  PROJECT(FirstExample)
  add_executable(prog first.c) 
  </code></pre>
  
  <p>Thanks!</p>