/usr/lib/x86_64-linux-gnu/pkgconfig/avahi-ui.pc is in libavahi-ui-dev 0.6.31-4ubuntu1.3.
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=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: avahi-ui
Description: Avahi Multicast DNS Responder (Common GTK2 UI support)
Requires: gtk+-2.0 avahi-client avahi-glib
Version: 0.6.31
Libs: -L${libdir} -lavahi-ui
Cflags: -D_REENTRANT -I${includedir}
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