/usr/lib/x86_64-linux-gnu/pkgconfig/libxfce4panel-1.0.pc is in xfce4-panel-dev 4.11.0-0ubuntu1.
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 12 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
localedir=${prefix}/share/locale
api=1.0
Name: libxfce4panel
Description: Library for the Xfce Panel
Requires: gtk+-2.0 gmodule-2.0 glib-2.0 libxfce4util-1.0
Version: 4.11.0
Libs: -L${libdir} -lxfce4panel-1.0
Cflags: -I${includedir}/xfce4/libxfce4panel-1.0
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