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When using CMAKE_FIND_ROOT_PATH, FindBoost is able to find the first component and cache the full path of the directory in Boost_LIBRARY_DIR so that all components are looked for in same directory. The issue was that, when looking for the other components, Boost_LIBRARY_DIR was re-rooted against CMAKE_FIND_ROOT_PATH even though it was already a path on the host. This change fixes this by disabling the re-rooting in the find_library call when using Boost_LIBRARY_DIR as a hint. See http://www.cmake.org/pipermail/cmake-developers/2014-October/011670.html
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