/usr/lib/x86_64-linux-gnu/pkgconfig/libukuipanelapplet-4.0.pc is in libukui-panel-applet-dev 1.1.3-0ubuntu1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libukui-panel-applet-4
Description: libukui-panel-applet-4
Requires: glib-2.0 gio-2.0 gtk+-3.0
Version: 1.1.2
Libs: -L${libdir} -lukui-panel-applet-4
Cflags: -I${includedir}/ukui-panel-4.0/libukui-panel-applet
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