NOT ABLE TO INSTALL REQUIREMENT FILES

I'm trying to clone an app into virtual environment but i keep getting the error below. Please what should i do about this "  error: command 'cl.exe' failed: No such file or directory"

Part of the code is shown below.

rs c:\users\user\envs\ososo\include\site\python3.6\rjsmin:

    running install

    running build

    running build_py

    creating build

    creating build\lib.win32-3.6

    copying .\rjsmin.py -> build\lib.win32-3.6

    running build_ext

    building '_rjsmin' extension

    creating build\temp.win32-3.6

    creating build\temp.win32-3.6\Release

    cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MT -DEXT_MODULE=_rjsmin -UEXT_PACKAGE -I_setup/include -Ic:\users\user\appdata\local\programs\python\python36-32\include -Ic:\users\user\appdata\local\programs\python\python36-32\include "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\Include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.17763.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6\include\um" /Tcrjsmin.c /Fobuild\temp.win32-3.6\Release\rjsmin.obj

    error: command 'cl.exe' failed: No such file or directory

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