How to resolve Minera cgminer "no devices found" error after installing additional GekkoScience USB-Antsticks?
Ok, any hardware additions to an existing Raspberry Pi * Minera environment or any adjustments to the hardware parameters specified in Minera Settings > Manual-options do indeed require recompiling cgminer.  In order to resolve, proceed with the following:


cd /var/www/minera
sudo nano build_miner.sh
Scroll down to the cgminer config and append -enable-blockerupter so the entire line displays CGMINER_CONFIG="--enable-avalon2 --enable-bflsc --enable-bitforce --enable-bitfury --enable-drillbit --enable-hashfast --enable-icarus --enable-klondike --enable-modminer --enable-blockerupter"
Exit and Write.
Run sudo ./build_miner.sh all
Upon compiling, exit from your host-session, unplug the antsticks, power-cycle the Raspberry Pi and then plug-in antsticks.
Log-in to the Raspberry Pi and sign-in to Minera- you should see verifiable success displayed in the Minera Dashboard > Device Tree.