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You need to install the packages beforehand (using vcpkg install ).
(Then you could specify the toolchain as a CMake option:
-DCMAKE_TOOLCHAIN_FILE=C:\path\to\vcpkg\scripts\buildsystems\vcpkg.cmake
but this won’t work if you already specify a toolchain, such as when cross-compiling.)
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“include” it, instead, to avoid this problem:
Add this line to the project CMakeLists.txt before find_package():
include(/path/to/vcpkg/scripts/buildsystems/vcpkg.cmake)