+#ifdef CONFIG_DFU_SF
+extern int dfu_fill_entity_sf(struct dfu_entity *dfu, char *devstr, char *s);
+#else
+static inline int dfu_fill_entity_sf(struct dfu_entity *dfu, char *devstr,
+ char *s)
+{
+ puts("SF support not available!\n");
+ return -1;
+}
+#endif
+