/home/rdp/dev/ruby-benchmark-suite/benchmarks/rails/substruct/vendor/rails/activesupport/lib/active_support/vendor.rb:9:in `require’: no such file to load — builder (LoadError)
/home/rdp/dev/ruby-benchmark-suite/benchmarks/rails/substruct/vendor/rails/activesupport/lib/active_support/vendor.rb:9:in `require’: no such file to load — builder (LoadError)
meant “you are missing the builder gem which is somehow not expected…”