Enable C++14 flag for ROS needed for PointCloudLibrary. #1
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I was attempting to follow the install instructions in the README, using Ubuntu 20.04 and ROS Noetic. The build failed with both cmake and catkin_make. It appears that PointCloudLibrary requires C++14, but C++11 is set by default. I have set the flag for ROS1 following the example from ROS2, and the build succeds.