/usr/include/gucharmap-2.90/ is in libgucharmap-2-90-dev 1:3.10.1-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gucharmap-2.90/gucharmap/
/usr/include/gucharmap-2.90/gucharmap/gucharmap-block-chapters-model.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-block-codepoint-list.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-chapters-model.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-chapters-view.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-charmap.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-chartable.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-codepoint-list.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-script-chapters-model.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-script-codepoint-list.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-type-builtins.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap-unicode-info.h
/usr/include/gucharmap-2.90/gucharmap/gucharmap.h