define Package/freifunk-firewall/postinst
#!/bin/sh
-[ -n "${IPKG_INSTROOT}" ] || {
+[ -n "$${IPKG_INSTROOT}" ] || {
if ! grep -q /etc/firewall.freifunk /etc/config/firewall; then
uci add firewall include >/dev/null
uci set firewall.@include[-1].path=/etc/firewall.freifunk