meta-openembedded/meta-gnome/conf/layer.conf

# We have a conf and classes directory, prepend to BBPATH to prefer our versions
BBPATH := "${LAYERDIR}:${BBPATH}"

# We have a recipes directory, add to BBFILES
BBFILES := "${BBFILES} ${LAYERDIR}/recipes-*/*/*.bb ${LAYERDIR}/recipes-*/*/*.bbappend"

BBFILE_COLLECTIONS += "gnome-layer"
BBFILE_PATTERN_gnome-layer := "^${LAYERDIR}/"
BBFILE_PRIORITY_gnome-layer = "7"