pip install dlibでエラーが発生する

Question

前提・実現したいこと

python3.7で「pip install --user dlib」を実行したい
環境：python3.7.3
cmake3.15.0
visual studio2015

発生している問題・エラーメッセージ

pip install --user dlibを実行すると、長文の赤文字エラーが発生する

ERROR: Command errored out with exit status 1:
     command: 'c:\users\yu061\appdata\local\programs\python\python37\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\setup.py'"'"'; __file__='"'"'C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\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\yu061\AppData\Local\Temp\pip-record-yfb372o2\install-record.txt' --single-version-externally-managed --user --prefix= --compile --install-headers 'C:\Users\yu061\AppData\Roaming\Python\Python37\Include\dlib'
         cwd: C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\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 3.7.3 (v3.7.3:ef4ec6ed12, Mar 25 2019, 22:22:05) [MSC v.1916 64 bit (AMD64)]
    Invoking CMake setup: 'cmake C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\tools\python -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\build\lib.win-amd64-3.7 -DPYTHON_EXECUTABLE=c:\users\yu061\appdata\local\programs\python\python37\python.exe -DCMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE=C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\build\lib.win-amd64-3.7 -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/yu061/AppData/Local/Temp/pip-install-caxkfyc6/dlib/build/temp.win-amd64-3.7/Release/CMakeFiles/CMakeOutput.log".
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\setup.py", line 261, in <module>
        'Topic :: Software Development',
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\site-packages\setuptools\__init__.py", line 145, in setup
        return distutils.core.setup(**attrs)
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\distutils\core.py", line 148, in setup
        dist.run_commands()
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\distutils\dist.py", line 966, in run_commands
        self.run_command(cmd)
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\distutils\dist.py", line 985, in run_command
        cmd_obj.run()
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\site-packages\setuptools\command\install.py", line 61, in run
        return orig.install.run(self)
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\distutils\command\install.py", line 545, in run
        self.run_command('build')
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\distutils\cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\distutils\dist.py", line 985, in run_command
        cmd_obj.run()
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\distutils\command\build.py", line 135, in run
        self.run_command(cmd_name)
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\distutils\cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\distutils\dist.py", line 985, in run_command
        cmd_obj.run()
      File "C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\setup.py", line 135, in run
        self.build_extension(ext)
      File "C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\setup.py", line 172, in build_extension
        subprocess.check_call(cmake_setup, cwd=build_folder)
      File "c:\users\yu061\appdata\local\programs\python\python37\lib\subprocess.py", line 347, in check_call
        raise CalledProcessError(retcode, cmd)
    subprocess.CalledProcessError: Command '['cmake', 'C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\tools\python', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\build\lib.win-amd64-3.7', '-DPYTHON_EXECUTABLE=c:\users\yu061\appdata\local\programs\python\python37\python.exe', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE=C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\build\lib.win-amd64-3.7', '-A', 'x64']' returned non-zero exit status 1.
    ----------------------------------------
ERROR: Command errored out with exit status 1: 'c:\users\yu061\appdata\local\programs\python\python37\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\dlib\setup.py'"'"'; __file__='"'"'C:\Users\yu061\AppData\Local\Temp\pip-install-caxkfyc6\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\yu061\AppData\Local\Temp\pip-record-yfb372o2\install-record.txt' --single-version-externally-managed --user --prefix= --compile --install-headers 'C:\Users\yu061\AppData\Roaming\Python\Python37\Include\dlib' Check the logs for full command output.

エラーを示しているだろうメッセージ

Building for: NMake Makefiles
    CMake Error at CMakeLists.txt:3 (project):
      Generator

        NMake Makefiles

      does not support platform specification, but platform

        x64

      was specified.

試したこと

Visual stdio2015の修復
Cmakeの修復

補足情報（FW/ツールのバージョンなど）

ここにより詳細な情報を記載してください。

Answer 1

PATH（C:/Program/Files/CMake/bin）にcmakeを追加
次に、```pip install dlib==19.4

でどうでしょうか？

Answer 2

meliさんの解答どおり実行しましたが解決せず、あきらめて

①TotalUninstallerでVisual Studioをアンインストールののち再インストール
②Cmakeをアンインストールののち再インストール

を行いました。Cドライブ容量の関係上DドライブにVisual Studioをインストールしていましたが、Cドライブにインストールし直しました。
※DドライブにインストールしていたときもVisual Studioはシステム環境変数に追加していました。

結果上手くいきましたがエラーの原因は、おそらくCmakeではなくVisualStudioであった可能性が高いと思います。