/usr/include/libreoffice/com/sun/ is in libreoffice-dev-common 1:6.0.3-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/libreoffice/com/sun/star/
/usr/include/libreoffice/com/sun/star/uno/
/usr/include/libreoffice/com/sun/star/uno/Any.h
/usr/include/libreoffice/com/sun/star/uno/Any.hxx
/usr/include/libreoffice/com/sun/star/uno/Reference.h
/usr/include/libreoffice/com/sun/star/uno/Reference.hxx
/usr/include/libreoffice/com/sun/star/uno/Sequence.h
/usr/include/libreoffice/com/sun/star/uno/Sequence.hxx
/usr/include/libreoffice/com/sun/star/uno/Type.h
/usr/include/libreoffice/com/sun/star/uno/Type.hxx
/usr/include/libreoffice/com/sun/star/uno/genfunc.h
/usr/include/libreoffice/com/sun/star/uno/genfunc.hxx