/usr/lib/x86_64-linux-gnu/pkgconfig/xfce4-session-2.0.pc is in xfce4-session 4.10.1-3ubuntu5.
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=${prefix}/include
Name: xfce4-session
Description: Xfce 4 session manager
Requires: libxfce4ui-1 libxfconf-0
Version: 4.10.1
Libs: -L${libdir} -lxfsm-4.6
Cflags: -I${includedir}/xfce4/xfce4-session-4.6
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