/usr/lib/x86_64-linux-gnu/pkgconfig/r3.pc is in libr3-dev 1.3.4-1.
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=${prefix}
includedir=${prefix}/include/r3
libdir=${prefix}/lib/x86_64-linux-gnu
Name: r3
Description: High-performance URL router library
Version: 1.3.3
Requires: libpcre
Libs: -L${libdir} -lr3
CFlags: -I${includedir}
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