BUG:  Read documentation for FindBoost.cmake

$(which cmake)/../share/cmake/Modules/FindBoost.cmake

boost-config.cmake and stores the result in cache entry "Boost_DIR".
Set Boost_NO_BOOST_CMAKE to ON to disable the search for boost-cmake.
COMP: Remove pointless error message after find_package

When find_package is used with the REQUIRED option, then there is no need
to do sanity checks afterwards. Processing stops if the find_package fails.