Default toolchain.cmake generated by Eclipse plugin sets CMAKE_FIND_ROOT_PATH as empty. This causes issues with find_path using CMAKE_FIND_ROOT_PATH as the HINT. The toolchain.cmake file should instead set CMAKE_FIND_ROOT_PATH to $ENV{OECORE_NATIVE_SYSROOT} ${OECORE_TARGET_SYSROOT}.
http://git.yoctoproject.org/cgit/cgit.cgi/eclipse-poky-kepler/commit/?id=409fe2342dcf674bb9ad44dba59adafd16b80761