Error in compiling ROS kinetic on Raspberry Pi

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I'm receiving same errors when compiling ROS on Raspberry pi , below errors

==> Processing plain cmake package: 'octomap' ==> Building with env: '/opt/ros/kinetic/env.sh' Makefile exists, skipping explicit cmake invocation... ==> make cmake_check_build_system in '/home/pi/ros_catkin_ws/build_isolated/octomap/install' ==> ninja -j4 in '/home/pi/ros_catkin_ws/build_isolated/octomap/install' /opt/ros/kinetic/env.sh: 16: exec: ninja: not found <== Failed to process package 'octomap': Command '['/opt/ros/kinetic/env.sh', 'ninja', '-j4']' returned non-zero exit status 127

Reproduce this error by running: ==> cd /home/pi/ros_catkin_ws/build_isolated/octomap && /opt/ros/kinetic/env.sh ninja -j4

Command failed, exiting.