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It seems you have a copy of rosserial_msgs in /opt/ros/fuerte/stacks that was notinstalled using apt-get, as if you had copied it to there. This you should not do, as you do not have write permissions there. Packages installed via apt-get have a ROS_NOBUILD file that prevents the attemt to write, yours seem to be lacking that file. Delete the rosserial stack in /opt/ros/fuerte, and either get it from apt-get, or put it somewhere under your home directory (e.g. in a rosinstall workspace).