Here is my alternative setup for M:Tier binpatches. It differs slightly from offical setup.

I use /etc/pkg.conf instead of defining a $PKG_PATH variable. It looks like:

installpath = http://ftp.spline.de/pub/OpenBSD/%c/packages/%a/
installpath += https://stable.mtier.org/updates/%c/%a

The daily check is performed with /etc/daily.local instead of defining cron entry directly. It also fetches source tree updates.

#!/bin/sh

updatesrc() {
    echo "Updating Source Tree"
    echo
    VERSION=OPENBSD_$(uname -r | tr . _)
    MODULES='src ports' # you may wish to add xenocara too
    CVSROOT=anoncvs@openbsd.cs.fau.de:/cvs
    (cd /usr && cvs -qd ${CVSROOT} up -APCd -r${VERSION} ${MODULES})
    echo
}

updatepkg() {
    echo "Checking package changes"
    echo
    pkg_add -sux
    echo
}

updatesrc
updatepkg

And finaly updating itself is performed as usual with pkg_add -ui.

PS: don't forget to fetch the current siging key:

cd /etc/signify && ftp https://stable.mtier.org/mtier-59-pkg.pub