Even if I got another errors, I guess my reported issue has been solved:
C:\Project\my-project>make
mkdir -p build; \
cd build; \
cmake ../ -DCMAKE_TOOLCHAIN_FILE=C:/Project/vcpkg/scripts/buildsystems/vcpkg.cmake
-- Selecting Windows SDK version 10.0.17763.0 to target Windows 10.0.19044.
-- The CXX compiler identification is MSVC 19.16.27045.0
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - failed
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.16.27023/bin/Hostx86/x86/cl.exe
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.16.27023/bin/Hostx86/x86/cl.exe - broken
CMake Error at C:/Home/Flaviu/cmake-3.21.1-windows-x86_64/share/cmake-3.21/Modules/CMakeTestCXXCompiler.cmake:62 (message):
The C++ compiler
"C:/Program Files (x86)/Microsoft Visual Studio/2017/Community/VC/Tools/MSVC/14.16.27023/bin/Hostx86/x86/cl.exe"
is not able to compile a simple test program.
Note: Selecting Windows SDK version 10.0.17763.0 to target Windows 10.0.19044.
So, I thank you for your assistance and implication !