Re OpenMPI: That makes sense. I have Gazebo, the robot simulation system installed, which pulls in ROS, the Robot Operating System and a lot of numerical tools. That probably pulled in OpenMPI at some point.
Gazebo is a standard Ubuntu package in 12.04LTS, which is the recommended Linux distro for Gazebo.
Re OpenMPI: That makes sense. I have Gazebo, the robot simulation system installed, which pulls in ROS, the Robot Operating System and a lot of numerical tools. That probably pulled in OpenMPI at some point.
Gazebo is a standard Ubuntu package in 12.04LTS, which is the recommended Linux distro for Gazebo.