/usr/ is in libmypaint-dev 1.3.0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/libmypaint/
/usr/include/libmypaint/mypaint-brush-settings-gen.h
/usr/include/libmypaint/mypaint-brush-settings.h
/usr/include/libmypaint/mypaint-brush.h
/usr/include/libmypaint/mypaint-config.h
/usr/include/libmypaint/mypaint-fixed-tiled-surface.h
/usr/include/libmypaint/mypaint-glib-compat.h
/usr/include/libmypaint/mypaint-mapping.h
/usr/include/libmypaint/mypaint-rectangle.h
/usr/include/libmypaint/mypaint-surface.h
/usr/include/libmypaint/mypaint-tiled-surface.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libmypaint.pc
/usr/share/
/usr/share/doc/
/usr/share/doc/libmypaint-dev/
/usr/share/doc/libmypaint-dev/copyright
/usr/share/gir-1.0/
/usr/share/gir-1.0/MyPaint-1.3.gir
/usr/lib/x86_64-linux-gnu/libmypaint.so
/usr/share/doc/libmypaint-dev/changelog.Debian.gz