/usr/ is in libnx-x11-dev 2:3.5.99.16-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/
/usr/include/
/usr/include/x86_64-linux-gnu/
/usr/include/x86_64-linux-gnu/nx-X11/
/usr/include/x86_64-linux-gnu/nx-X11/ImUtil.h
/usr/include/x86_64-linux-gnu/nx-X11/XKBlib.h
/usr/include/x86_64-linux-gnu/nx-X11/Xauth.h
/usr/include/x86_64-linux-gnu/nx-X11/Xcms.h
/usr/include/x86_64-linux-gnu/nx-X11/Xlib.h
/usr/include/x86_64-linux-gnu/nx-X11/XlibConf.h
/usr/include/x86_64-linux-gnu/nx-X11/Xlibint.h
/usr/include/x86_64-linux-gnu/nx-X11/Xlocale.h
/usr/include/x86_64-linux-gnu/nx-X11/Xregion.h
/usr/include/x86_64-linux-gnu/nx-X11/Xresource.h
/usr/include/x86_64-linux-gnu/nx-X11/Xutil.h
/usr/include/x86_64-linux-gnu/nx-X11/cursorfont.h
/usr/include/x86_64-linux-gnu/nx-X11/misc.h
/usr/include/x86_64-linux-gnu/nx-X11/os.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/libNX_X11.a
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/nx-x11.pc
/usr/share/
/usr/share/doc/libnx-x11-dev/
/usr/share/doc/libnx-x11-dev/copyright
/usr/lib/x86_64-linux-gnu/libNX_X11.so
/usr/share/doc/libnx-x11-dev/changelog.Debian.gz