/usr/lib/x86_64-linux-gnu/pkgconfig/libmpg123.pc is in libmpg123-dev 1.20.1-2+deb8u1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libmpg123
Description: An optimised MPEG Audio decoder
Requires:
Version: 1.20.1
Libs: -L${libdir} -lmpg123
Cflags: -I${includedir}
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