ipcalc applet by Stephan Linz and Jordan Crouse
diff --git a/include/applets.h b/include/applets.h
index a9f93cc..e8bcb0e 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -254,6 +254,9 @@
 #ifdef CONFIG_IP
 	APPLET(ip, ip_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif
+#ifdef CONFIG_IPCALC
+	APPLET(ipcalc, ipcalc_main, _BB_DIR_BIN, _BB_SUID_NEVER)
+#endif
 #ifdef CONFIG_KILL
 	APPLET(kill, kill_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif