ninja: error: '/usr/local/lib/libprotobuf.a',

[arjunskumar]

ninja: error: '/usr/local/lib/libprotobuf.a', needed by '/home/arjun/catkin_ws/devel_isolated/cartographer_ros/lib/cartographer_ros/cartographer_pbstream_to_ros_map', missing and no known rule to make it <== Failed to process package 'cartographer_ros': Command '['/home/arjun/catkin_ws/install_isolated/env.sh', 'ninja', '-j16', '-l16']' returned non-zero exit status 1.

any idea how i can solve this?

[georgflick]

Seems like a missing protobuf dependency. Have you installed the debian package "libprotobuf-dev" ?