title: Unable to generate makefile from CMake
body: <p>I'm interested in CMake, so decided to learn about it. I followed the <a href="https://cmake.org/cmake-tutorial/" rel="nofollow noreferrer">CMake Tutorial</a> until the point where it states "That is all there is to it. At this point you should be able to build the tutorial", so I thought, let's try it! </p>
  
  <p>Alas, it seems it wasn't all so simple. I initially attempted to run <code>cmake -A "Unix Makefiles"</code> after consulting <code>cmake --help</code>, but no luck there either. Rather, it gives me the following:</p>
  
  <pre><code>CMake Error at CMakeLists.txt:2 (project):
    Generator
  
      Unix Makefiles
  
    does not support platform specification, but platform
  
      Unix Makefiles
  
    was specified.
  
  
  CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
  CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
  </code></pre>
  
  <p>I began searching around on the Internet and found <a href="https://stackoverflow.com/questions/37336915/why-isnt-the-command-cmake-generating-a-makefile">this</a>, but it gave me the exact same error. Other answers I found seemed to be Windows-related, but myself I'm on Fedora 29. </p>
  
  <p>I want to generate a makefile using CMake, any suggestions? (I have gcc and g++ installed, by the way)</p>