PACKAGES_FOUND
From Get docs
Cmake/docs/3.21/prop gbl/packages found
PACKAGES_FOUND
List of packages which were found during the CMake run.
List of packages which were found during the CMake run. Whether a package has been found is determined using the _FOUND variables.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.21/prop_gbl/PACKAGES_FOUND.html