This installs systemd unit files into /usr/local, just like the binaries.
The systemd documentation claims to read this directory as well.
[ systemd=false ]
)
-AS_IF([test "x$with_systemd" = "xyes"], [systemd_path="/lib/systemd/system"],
+AS_IF([test "x$with_systemd" = "xyes"], [systemd_path="\${libdir}/systemd/system"],
[AS_IF([test "x$with_systemd" = "xno"], [systemd=false])])
AC_SUBST(systemd_path, $systemd_path)