使用PCL編譯某個ROS工程時出現這個waring：
** 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 ** visualization features related to openni2 will be disabled
找到對應log文件後發現是OpenNI沒有
Could NOT find OpenNI2 (missing: OPENNI2_LIBRARY OPENNI2_INCLUDE_DIRS)
所以就安裝OpenNI就好：
sudo apt-get install openni2-utils