title: Fail to install dlib on windows10
body: <p>Following a YouTube video about face recognition, I installed Python 3.8.2, then CMAKE, and then dlib. The dlib failed with the following message. At first I had python 32 bits, then I removed it and installed the 64 bit version, with same problem. Any idea?</p>
  
  <p>I did the same flow on a another computer, with a similar error, that was solved after installing CMake. In this case CMake is installed.
  What did I miss?</p>
  
  <pre><code>C:\Users\NH5&gt;pip install dlib
  Defaulting to user installation because normal site-packages is not writeable
  Collecting dlib
    Using cached dlib-19.19.0.tar.gz (3.2 MB)
  Could not build wheels for dlib, since package 'wheel' is not installed.
  Installing collected packages: dlib
      Running setup.py install for dlib ... error
      ERROR: Command errored out with exit status 1:
       command: 'c:\program files\python38\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\NH5\\AppData\\Local\\Temp\\pip-install-7c571567\\dlib\\setup.py'"'"'; __file__='"'"'C:\\Users\\NH5\\AppData\\Local\\Temp\\pip-install-7c571567\\dlib\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\NH5\AppData\Local\Temp\pip-record-wm_xgg14\install-record.txt' --single-version-externally-managed --user --prefix= --compile --install-headers 'C:\Users\NH5\AppData\Roaming\Python\Python38\Include\dlib'
           cwd: C:\Users\NH5\AppData\Local\Temp\pip-install-7c571567\dlib\
      Complete output (57 lines):
      running install
      running build
      running build_py
      package init file 'dlib\__init__.py' not found (or not a regular file)
      running build_ext
      Building extension for Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 23:03:10) [MSC v.1916 64 bit (AMD64)]
      Invoking CMake setup: 'cmake C:\Users\NH5\AppData\Local\Temp\pip-install-7c571567\dlib\tools\python -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=C:\Users\NH5\AppData\Local\Temp\pip-install-7c571567\dlib\build\lib.win-amd64-3.8 -DPYTHON_EXECUTABLE=c:\program files\python38\python.exe -DCMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE=C:\Users\NH5\AppData\Local\Temp\pip-install-7c571567\dlib\build\lib.win-amd64-3.8 -A x64'
      -- Building for: NMake Makefiles
      CMake Error at CMakeLists.txt:3 (project):
        Generator
  
          NMake Makefiles
  
        does not support platform specification, but platform
  
          x64
  
        was specified.
  
  
      CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
      CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
      -- Configuring incomplete, errors occurred!
      See also "C:/Users/NH5/AppData/Local/Temp/pip-install-7c571567/dlib/build/temp.win-amd64-3.8/Release/CMakeFiles/CMakeOutput.log".
      Traceback (most recent call last):
        File "&lt;string&gt;", line 1, in &lt;module&gt;
        File "C:\Users\NH5\AppData\Local\Temp\pip-install-7c571567\dlib\setup.py", line 223, in &lt;module&gt;
          setup(
        File "c:\program files\python38\lib\site-packages\setuptools\__init__.py", line 145, in setup
          return distutils.core.setup(**attrs)
        File "c:\program files\python38\lib\distutils\core.py", line 148, in setup
          dist.run_commands()
        File "c:\program files\python38\lib\distutils\dist.py", line 966, in run_commands
          self.run_command(cmd)
        File "c:\program files\python38\lib\distutils\dist.py", line 985, in run_command
          cmd_obj.run()
        File "c:\program files\python38\lib\site-packages\setuptools\command\install.py", line 61, in run
          return orig.install.run(self)
        File "c:\program files\python38\lib\distutils\command\install.py", line 545, in run
          self.run_command('build')
        File "c:\program files\python38\lib\distutils\cmd.py", line 313, in run_command
          self.distribution.run_command(command)
        File "c:\program files\python38\lib\distutils\dist.py", line 985, in run_command
          cmd_obj.run()
        File "c:\program files\python38\lib\distutils\command\build.py", line 135, in run
          self.run_command(cmd_name)
        File "c:\program files\python38\lib\distutils\cmd.py", line 313, in run_command
          self.distribution.run_command(command)
        File "c:\program files\python38\lib\distutils\dist.py", line 985, in run_command
          cmd_obj.run()
        File "C:\Users\NH5\AppData\Local\Temp\pip-install-7c571567\dlib\setup.py", line 135, in run
          self.build_extension(ext)
        File "C:\Users\NH5\AppData\Local\Temp\pip-install-7c571567\dlib\setup.py", line 172, in build_extension
          subprocess.check_call(cmake_setup, cwd=build_folder)
        File "c:\program files\python38\lib\subprocess.py", line 364, in check_call
          raise CalledProcessError(retcode, cmd)
      subprocess.CalledProcessError: Command '['cmake', 'C:\\Users\\NH5\\AppData\\Local\\Temp\\pip-install-7c571567\\dlib\\tools\\python', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=C:\\Users\\NH5\\AppData\\Local\\Temp\\pip-install-7c571567\\dlib\\build\\lib.win-amd64-3.8', '-DPYTHON_EXECUTABLE=c:\\program files\\python38\\python.exe', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE=C:\\Users\\NH5\\AppData\\Local\\Temp\\pip-install-7c571567\\dlib\\build\\lib.win-amd64-3.8', '-A', 'x64']' returned non-zero exit status 1.
      ----------------------------------------
  ERROR: Command errored out with exit status 1: 'c:\program files\python38\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\NH5\\AppData\\Local\\Temp\\pip-install-7c571567\\dlib\\setup.py'"'"'; __file__='"'"'C:\\Users\\NH5\\AppData\\Local\\Temp\\pip-install-7c571567\\dlib\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\NH5\AppData\Local\Temp\pip-record-wm_xgg14\install-record.txt' --single-version-externally-managed --user --prefix= --compile --install-headers 'C:\Users\NH5\AppData\Roaming\Python\Python38\Include\dlib' Check the logs for full command output.
  
  C:\Users\NH5&gt;
  </code></pre>