/usr/lib/x86_64-linux-gnu/pkgconfig/libbluray.pc is in libbluray-dev 1:1.0.2-3.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libbluray
Description: library supporting Blu-ray playback
Version: 1.0.2
Libs: -L${libdir} -lbluray
Libs.private: -ldl -lfontconfig -lfreetype
Requires.private: libxml-2.0 freetype2 fontconfig
Cflags: -I${includedir}
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