Some systems define it to /usr/lib64 on 64-bit systems, which is not
where systemd looks for unit files. Just hardcode 'lib' in the install
prefix until we get to use the pkg-config file.
https://gitlab.gnome.org/GNOME/gnome-shell/issues/424
# systemduserunitdir = systemd_dep.get_pkgconfig_variable('systemduserunitdir',
# define_variable: ['prefix', prefix])
# and uncomment systemd_dep below
-systemduserunitdir = join_paths(libdir, 'systemd', 'user')
+systemduserunitdir = join_paths(prefix, 'lib', 'systemd', 'user')
keybindings_dep = dependency('gnome-keybindings', required: false)
if keybindings_dep.found()