/usr/lib/x86_64-linux-gnu/pkgconfig/fishsound.pc is in libfishsound1-dev 1.0.0-6.
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=${prefix}/include
Name: fishsound
Description: Encode and decode Vorbis, Speex, FLAC audio
Requires: vorbis vorbisenc speex flac
Version: 1.0.0
Libs: -L${libdir} -lfishsound
Libs.private: -lvorbisenc -lvorbis -lspeex -lFLAC
Cflags: -I${includedir}
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