In /etc/init.d/htpdate, if [[ -z ${SERVERS} ]] ; then should be if [ -z "${SERVERS}" ] ; then
should be all set now in the tree; thanks for the report! Commit message: Fix simple bashism in init.d script http://sources.gentoo.org/net-misc/htpdate/files/htpdate.init?r1=1.3&r2=1.4