CFLAGS="-march=native -O2 -pipe" CXXFLAGS="${CFLAGS}" CHOST="x86_64-pc-linux-gnu" USE="" ACCEPT_LICENSE="*" EUSCAN_ROOT="/path/to/euscan/local" PORTDIR="${EUSCAN_ROOT}/usr/portage" PORTDIR_OVERLAY="$PORTDIR" FEATURES="$FEATURES -strict metadata-transfer" ## Add overlays here # PORTDIR_OVERLAY="${EUSCAN_ROOT}/usr/local/portage $PORTDIR_OVERLAY" ## Or use layman # source ${EUSCAN_ROOT}/var/lib/layman/make.conf