/usr/lib/pkgconfig/compiz-scale.pc is in compiz-dev 1:0.9.7.6-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | prefix=/usr
exec_prefix=/usr/bin
libdir=/usr/lib/compiz
includedir=/usr/include
Name: compiz-scale
Description: Scale plugin for compiz
Version: 0.9.7.6
Requires: compiz compiz-composite compiz-opengl
Libs: -L${libdir} -lscale
Cflags: -pthread -I/usr/include/libxml2 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/glibmm-2.4 -I/usr/lib/x86_64-linux-gnu/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib/x86_64-linux-gnu/sigc++-2.0/include -I/usr/include/startup-notification-1.0 -I/usr/include -I${includedir}/compiz
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