GEM remote: https://rubygems.org/ specs: ffi (1.15.0) google-protobuf (3.15.6) libusb (0.6.4) ffi (~> 1.0) mini_portile2 (~> 2.1) mini_portile2 (2.5.0) nokogiri (1.11.2) mini_portile2 (~> 2.5.0) racc (~> 1.4) racc (1.5.2) rubyserial (0.6.0) ffi (~> 1.9, >= 1.9.3) PLATFORMS ruby DEPENDENCIES google-protobuf libusb nokogiri rubyserial BUNDLED WITH 2.1.4