MSVC60

From Get docs
Cmake/docs/3.21/variable/msvc60


MSVC60

Discouraged. Use the MSVC_VERSION variable instead.

True when using Microsoft Visual C++ 6.0.

Set to true when the compiler is version 6.0 of Microsoft Visual C++.

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https://cmake.org/cmake/help/v3.21/variable/MSVC60.html