/usr/lib/x86_64-linux-gnu/pkgconfig/getdns.pc is in libgetdns-dev 1.1.0~a2-2.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: getdns
Version: 1.1.0-a2
Description: A modern asynchronous DNS library
Libs: -L${libdir} -lgetdns
Cflags: -I${includedir}
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