rosrun turtlesim turtlesim_node -- couldn't find executable

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Hi,

I just installed ros groovy from source on gentoo amd64 and am working through the beginner's tutorials. I'm on the "Understanding ROS Nodes" tutorial and installed the ros_tutorials metapackage from git using catkin_make in a catkin ws. I've sourced the correct env variables and rospack list shows that ros_tutorials/turtlesim package is installed. However, the above mentioned command fails, and a listing of all the turtlesim related directories shows no file named as turtlesim_node. Here is my output:

$ rosrun turtlesim turtlesim_node
[rosrun] Couldn't find executable named turtlesim_node below /home/user/ros-groovy-metapackages/src/ros_tutorials/turtlesim
$ roscd turtlesim
$ ls *
CMakeLists.txt  mainpage.dox  package.xml

images:
box-turtle.png   electric.png  groovy.png   robot-turtle.png  turtle.png
diamondback.png  fuerte.png    palette.png  sea-turtle.png    turtle.xar

include:
turtlesim

launch:
multisim.launch

msg:
Color.msg  Pose.msg

src:
turtle.cpp  turtle_frame.cpp  turtlesim  turtlesim.cpp

srv:
Kill.srv  SetPen.srv  Spawn.srv  TeleportAbsolute.srv  TeleportRelative.srv

tutorials:
draw_square.cpp  mimic.cpp  teleop_turtle_key.cpp