/usr/include/clc/geometric/ is in libclc-dev 0.2.0+git20180312-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/clc/geometric/cross.h
/usr/include/clc/geometric/distance.h
/usr/include/clc/geometric/distance.inc
/usr/include/clc/geometric/dot.h
/usr/include/clc/geometric/dot.inc
/usr/include/clc/geometric/fast_distance.h
/usr/include/clc/geometric/fast_distance.inc
/usr/include/clc/geometric/fast_length.h
/usr/include/clc/geometric/fast_length.inc
/usr/include/clc/geometric/fast_normalize.h
/usr/include/clc/geometric/fast_normalize.inc
/usr/include/clc/geometric/floatn.inc
/usr/include/clc/geometric/length.h
/usr/include/clc/geometric/length.inc
/usr/include/clc/geometric/normalize.h
/usr/include/clc/geometric/normalize.inc