diff --git a/build.sh b/build.sh
index 4803e0bb..39f4437c 100755
--- a/build.sh
+++ b/build.sh
@@ -1,4 +1,11 @@
 #!/bin/sh
+#
+# Copyright (C) 2017 OVH OverTheBox
+# Copyright (C) 2017-2020 Ycarus (Yannick Chabanois) <ycarus@zugaina.org> for OpenMPTCProuter project
+#
+# This is free software, licensed under the GNU General Public License v3.
+# See /LICENSE for more information.
+#
 
 set -e
 
diff --git a/config b/config
index 4abe05ec..b45b6c96 100644
--- a/config
+++ b/config
@@ -7,6 +7,7 @@ CONFIG_BUSYBOX_CONFIG_ARP=y
 CONFIG_BUSYBOX_CONFIG_ARPING=y
 CONFIG_BUSYBOX_CONFIG_ASH_RANDOM_SUPPORT=y
 CONFIG_BUSYBOX_CONFIG_BASE64=y
+CONFIG_BUSYBOX_CONFIG_BC=y
 CONFIG_BUSYBOX_CONFIG_CHPASSWD=y
 CONFIG_BUSYBOX_CONFIG_DELUSER=y
 CONFIG_BUSYBOX_CONFIG_DIFF=y