/usr/lib/x86_64-linux-gnu/pkgconfig/avahi-client.pc is in libavahi-client-dev 0.6.32-2.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: avahi-client
Description: Avahi Multicast DNS Responder (Client Support)
Version: 0.6.32
Libs: -L${libdir} -lavahi-common -lavahi-client
Cflags: -D_REENTRANT -I${includedir}
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