/usr/lib/x86_64-linux-gnu/pkgconfig/libiso9660.pc is in libiso9660-dev 1.0.0-2ubuntu2.
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=${prefix}
libdir=${exec_prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
libiconv=
Name: libiso9660
Description: ISO-9660 library of libcdio
Version: 1.0.0
Requires: libcdio
Libs: -L${libdir} -liso9660 -lcdio
Cflags: -I${includedir}
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