title: Link SDL2_net with CMake
body: <p>I'm trying to link SDL2_net (SDL_net 2.0) to my project via CMake, but after searching around I've yet to find a solution. My CMakeLists.txt currently looks like this:</p>
  
  <pre><code>1 cmake_minimum_required (VERSION 3.7)
  2 project (SDL_net_test)
  3 include (FindPkgConfig)
  4 include (FindSDL_net)
  5 
  6 pkg_search_module (SDL2 REQUIRED sdl2)
  7 pkg_search_module (SDL_NET REQUIRED sdl2_net)
  8 
  9 include_directories (${SDL2_INCLUDE_DIRS} ${SDL_NET_INCLUDE_DIRS})
  10 
  11 add_executable (SDL_net_test main.cpp)
  12 target_link_libraries (SDL_net_test ${SDL2_LIBRARIES} ${SDL_NET_LIBRARIES})
  </code></pre>
  
  <p>However, when I attempt to run CMake it gives me the following error(s):</p>
  
  <pre><code>-- Could NOT find SDL_net (missing: SDL_NET_LIBRARIES SDL_NET_INCLUDE_DIRS) 
  -- Checking for one of the modules 'sdl2_net'
  CMake Error at /usr/share/cmake/Modules/FindPkgConfig.cmake:659 (message):
  None of the required 'sdl2_net' found
  Call Stack (most recent call first):
  CMakeLists.txt:7 (pkg_search_module)
  
  
  CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
  Please set them or make sure they are set and tested correctly in the CMake files:
  SDL_NET_INCLUDE_DIR (ADVANCED)
     used as include directory in directory /home/neboula/Programming/sandbox/sdl2_net
     used as include directory in directory /home/neboula/Programming/sandbox/sdl2_net
     used as include directory in directory /home/neboula/Programming/sandbox/sdl2_net
  SDL_NET_LIBRARY (ADVANCED)
      linked by target "SDL_net_test" in directory /home/neboula/Programming/sandbox/sdl2_net
  
  -- Configuring incomplete, errors occurred!
  See also "/home/neboula/Programming/sandbox/sdl2_net/build/CMakeFiles/CMakeOutput.log".
  </code></pre>
  
  <p>I have installed the SDL2_net-devel package from my package manager (dnf on Fedora 29), and I've successfully linked SDL2 and SDL2_image previously basing it on <a href="https://stackoverflow.com/questions/23850472/how-to-use-sdl2-and-sdl-image-with-cmake">this answer</a>, which worked brilliantly. I also found <a href="https://cmake.org/cmake/help/v3.14/module/FindSDL_net.html" rel="nofollow noreferrer">this</a>, but I'm not entirely sure how to use it. How should I go about this?</p>