I am trying to learn how to use actionlib. I would like my client and server to use the actionlib generated messages from another package. I believe this should be possible, but I get a compilation error when compiling the client or server. Specifics: I took the turtle_actionlib tutorial and split it into 3 packages: trtl_msgs, trtl_client, and trtl_server. trtl_msgs contains no code and only has the .action files. I modified the CMake file accordingly and this rosmakes fine. (The .msg files get generated properly including the .h files and .py files.) When I try to rosmake the client, I get this error: /home/baxelrod/ros-tutorials/ros_pkg_tutorials/trtl_client/src/shape_cli ent.cpp:4:35: error: trtl_msgs/ShapeAction.h: No such file or directory I have double checked that trtl_msgs is listed as a dependency in the trtl_client manifest. And I can see that the trtl_msgs/ShapeAction.h file does exist. I don't know why it is not being found. Platform info: Linux version 2.6.28-19-server (buildd@rothera) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #62-Ubuntu SMP Wed Jul 28 02:58:24 UTC 2010 ROS version: Boxturtle I have attached my (very simple) sample code. Is this a limitation of actionlib, or am I missing something obvious? Thanks, -Ben -- Ben Axelrod Research Scientist iRobot Corporation 8 Crosby Drive, Mail Stop 8-1 Bedford, MA 01730 (781) 430-3315 (Tel) (781) 960-2628 (Fax) baxelrod@irobot.com