edit fenix/config/config
grep PACKAGE_LIST_ADDITIONAL= fenix/config/config -A6
PACKAGE_LIST_ADDITIONAL="wget nano alsa-utils btrfs-progs dosfstools hddtemp iotop iozone3 stress sysbench screen ntfs-3g vim pciutils \
evtest htop mmc-utils pv lsof libfuse2 libdigest-sha-perl libproc-processtable-perl aptitude dnsutils f3 haveged \
hdparm rfkill vlan sysstat net-tools bash-completion hostapd git ethtool network-manager unzip ifenslave lirc \
libpam-systemd iperf3 software-properties-common libnss-myhostname f2fs-tools avahi-autoipd iputils-arping bluetooth bluez bluez-tools watchdog \
i2c-tools qrencode rng-tools clinfo ocl-icd-libopencl1 libatlas3-base p7zip p7zip-full lrzip lzip lzop ncompress unar zstd edid-decode libgtk-3-0 dnsmasq-base \
ppp modemmanager mobile-broadband-provider-info"
add next string - its just example u must define necessary packages in this string
PACKAGE_LIST_ADDITIONAL="$PACKAGE_LIST_ADDITIONAL samba-common xrdp supertux"
or
PACKAGE_LIST_ADDITIONAL="$PACKAGE_LIST_ADDITIONAL $PACKAGE_LIST_USER"
PS: i will push this feature in next fenix something like this
export PACKAGE_LIST_USER="samba-common xrdp supertux"
make