# KEYRING := keys/debian-archive-${release}-security-automatic.gpg
ifndef SOURCES
- ifdef $(filter stretch jessie buster, ${release})
+ ifneq "$(filter stretch jessie buster, ${release})" ""
define SOURCES :=
deb http://cdn.debian.net/debian ${release} main
deb https://deb.debian.org/debian-security/ ${release}/updates main