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See https://cmake.org/cmake/help/v3.0/module/FindPackageHandleStandardArgs.html https://cmake.org/Wiki/CMake:How_To_Find_Libraries for details and the CMake doc why this variable is important. It could have been set using `SET()`, but this macro seems to be the recommanded way to do it. Change-Id: Ib612ac35299bf05dc5c8b4ebec46b681c06de72c Reviewed-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>
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