/meta-elabs$ tree
.
├── conf
│   └── layer.conf
└── recipes-graphics
    └── gphoto2
        ├── libgphoto2-2.4.11
        │   ├── 0001-configure.ac-remove-AM_PO_SUBDIRS.patch
        │   ├── 10-camera-libgphoto2-device.fdi
        │   ├── 10-camera-libgphoto2.fdi
        │   ├── 40-libgphoto2.rules
        │   └── allow.to.disable.gd.patch
        └── libgphoto2_2.4.11.bb
-----------------------------------------------------
/meta-elabs$ cat conf/layer.conf
# We have a conf and classes directory, add to BBPATH
BBPATH := "${BBPATH}:${LAYERDIR}"

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

BBFILE_COLLECTIONS += "elabs"
BBFILE_PATTERN_elabs := "^${LAYERDIR}/"
BBFILE_PRIORITY_elabs = "9"

-----------------------------------------------------
yocto_build/conf$ cat bblayers.conf
# LAYER_CONF_VERSION is increased each time build/conf/bblayers.conf
# changes incompatibly
LCONF_VERSION = "6"

BBPATH = "${TOPDIR}"
BBFILES ?= ""

BBLAYERS ?= " \
  /home/byoakum/galileo/meta-clanton_v1.1.0-dirty/meta \
  /home/byoakum/galileo/meta-clanton_v1.1.0-dirty/meta-iot-devkit \
  /home/byoakum/galileo/meta-clanton_v1.1.0-dirty/meta-yocto \
  /home/byoakum/galileo/meta-clanton_v1.1.0-dirty/meta-quark-bsp \
  /home/byoakum/galileo/meta-clanton_v1.1.0-dirty/meta-galileo \
  /home/byoakum/galileo/meta-clanton_v1.1.0-dirty/meta-elabs \
  "
BBLAYERS_NON_REMOVABLE ?= " \
  /home/byoakum/galileo/meta-clanton_v1.1.0-dirty/meta \
  /home/byoakum/galileo/meta-clanton_v1.1.0-dirty/meta-yocto \
  "