/usr/lib/pkgconfig/lxpanel.pc is in lxpanel 0.5.8+git20120212-0ubuntu3.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
datadir=${prefix}/share
Name: lxpanel
Description: A lightweight X11 desktop panel
Requires: glib-2.0 libmenu-cache
Version: 0.5.8
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