/usr/lib/x86_64-linux-gnu/ is in libclutter-1.0-dev 1.26.2+dfsg-4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/cally-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/clutter-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/clutter-cogl-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/clutter-egl-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/clutter-gdk-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/clutter-glx-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/clutter-wayland-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/clutter-wayland-compositor-1.0.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/clutter-x11-1.0.pc
/usr/lib/x86_64-linux-gnu/libclutter-1.0.so
/usr/lib/x86_64-linux-gnu/libclutter-glx-1.0.so