} ioam_trace_t;
-vlib_node_registration_t vxlan_gpe_encap_ioam_v4_node;
-vlib_node_registration_t vxlan_gpe_decap_ioam_v4_node;
-vlib_node_registration_t vxlan_gpe_transit_ioam_v4_node;
+extern vlib_node_registration_t vxlan_gpe_encap_ioam_v4_node;
+extern vlib_node_registration_t vxlan_gpe_decap_ioam_v4_node;
+extern vlib_node_registration_t vxlan_gpe_transit_ioam_v4_node;
clib_error_t *vxlan_gpe_ioam_enable (int has_trace_option, int has_pot_option,
int has_ppc_option);