/usr/lib/x86_64-linux-gnu/pkgconfig/ is in compiz-dev 1:0.9.13.1+18.04.20180302-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-animation.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-animationaddon.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-animationjc.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-compiztoolbox.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-composite.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-cube.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-mousepoll.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-opengl.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-scale.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz-text.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/compiz.pc