The env var used to determine the build tools path for compiling c stuff

[xwaeaewcrhomesysplug]

Running setup.py install for pysptk ... error
Complete output from command d:\coding\pyfastcache\pyvenv\qppwgnov2020stdref\scripts\python.exe -u -c "import setuptools, tokenize;file='C:\Users\sumur\AppData\Local\Temp\pip-install-a_nxk4m_\pysptk\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\sumur\AppData\Local\Temp\pip-record-bfudty5b\install-record.txt --single-version-externally-managed --compile --install-headers d:\coding\pyfastcache\pyvenv\qppwgnov2020stdref\include\site\python3.7\pysptk:
running install
running build
running build_py
-- Building version 0.1.18
creating build
creating build\lib.win-amd64-3.7
creating build\lib.win-amd64-3.7\pysptk
copying pysptk\conversion.py -> build\lib.win-amd64-3.7\pysptk
copying pysptk\sptk.py -> build\lib.win-amd64-3.7\pysptk
copying pysptk\synthesis.py -> build\lib.win-amd64-3.7\pysptk
copying pysptk\util.py -> build\lib.win-amd64-3.7\pysptk
copying pysptk\version.py -> build\lib.win-amd64-3.7\pysptk
copying pysptk_init_.py -> build\lib.win-amd64-3.7\pysptk
creating build\lib.win-amd64-3.7\pysptk\example_audio_data
copying pysptk\example_audio_data\arctic_a0007.wav -> build\lib.win-amd64-3.7\pysptk\example_audio_data
copying pysptk\example_audio_data\COPYING -> build\lib.win-amd64-3.7\pysptk\example_audio_data
running build_ext
skipping 'pysptk_sptk.c' Cython extension (up-to-date)
building 'pysptk._sptk' extension
error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": https://visualstudio.microsoft.com/downloads/

Again to rephrase,where is the Variable used to determine that the MVCpp does not exist.
I had a local copy but i do not know what is the Variable used.

[xwaeaewcrhomesysplug]

If you have no idea then simply copy and paste your Path env variable.It should be enough.