/usr/lib/x86_64-linux-gnu/pkgconfig/mrss.pc is in libmrss0-dev 0.19.2-6.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libmrss
Description: library C for creating, parsing and writing feed rss
Version: 0.19.2
Requires: nxml
Libs: -L${libdir} -lmrss
Cflags: -I${includedir}
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