/usr/lib/x86_64-linux-gnu/pkgconfig/libplacebo.pc is in libplacebo-dev 0.4.0-2.
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 | prefix=/usr
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libplacebo
Description: Reusable library for GPU-accelerated video/image rendering
Version: 0.4.0
Libs: -L${libdir} -lplacebo
Cflags: -I${includedir}
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