Firmware Build
Sources
https://github.com/gnubee-git/gnubee-openwrt (branch master, with official kernel from Soc vendor, Debian-compatible scripts)
https://gogs.librecmc.org/ldpinney/GnuBee-libreCMC (updated kernel, LibreCMC distribution)
References
https://wiki.openwrt.org/doc/howto/buildroot.exigence
https://wiki.openwrt.org/doc/howto/build
Commands after source retrieval
######## GIT #########
git pull && ./scripts/feeds update -a && ./scripts/feeds install -a
######## BUILD ########
make menuconfig
make -j1 V=s download
ionice -c 3 nice -n 19 make -j1 V=s | tee build.log
######## CLEAN ########
make dirclean
make target/linux/clean