distro.conf
MYDEFAULT_DISTRO_FEATURES = "mydefault"
BUILD_TYPE ?= "production"
DISTRO_FEATURES_append = " ${MY_DEFAULT_DISTRO_FEATURES} my-${BUILD_TYPE}"


do_install...

<-->if ${@bb.utils.contains('DISTRO_FEATURES','ny-production','true','false',d)}; then
...
<-->else
...
<-->fi
}
do_install[vardeps] += "DISTRO_FEATURES"