使用PCL编译某个ROS工程时出现这个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
找到对应log文件后发现是OpenNI没有
Could NOT find OpenNI2 (missing: OPENNI2_LIBRARY OPENNI2_INCLUDE_DIRS)
所以就安装OpenNI就好：
sudo apt-get install openni2-utils