autowarefo​undation/a​utoware Unknown warning in compiling file

autowarefoundation/autoware Unknown warning in compiling file

** WARNING ** io features related to openni will be disabled

** WARNING ** io features related to openni2 will be disabled

** WARNING ** io features related to pcap will be disabled

** WARNING ** io features related to png will be disabled

** WARNING ** io features related to libusb-1.0 will be disabled

** WARNING ** visualization features related to openni will be disabled

** WARNING ** visualization features related to openni2 will be disabled

** WARNING ** apps features related to openni will be disabled

The warning issue appears multiple times in compiling files, how to solve this? Thanks for any help!