ROS Tutorial clarification

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Hi,

I'm following the (catkin) tutorials to get started with ROS, and I run into the following.

In CreatingMsgAndSrv tutorial it says I should add this to my CMakeLists.txt:

find_package(catkin REQUIRED COMPONENTS roscpp rospy std_msgs message_generation)

But in the next tutorial (WritingPublisherSubscriber) it says I should have this:

find_package(catkin REQUIRED COMPONENTS roscpp rospy std_msgs genmsg)

Another inconsistency I found:

Also make sure you export the message runtime dependency.

catkin_package( ... CATKIN_DEPENDS message_runtime ... )

while on the next page:

catkin_package()

So, the question is, which one of these should I use? Does it matter? What's the difference?

Thanks

The links for pages mentioned:

ros.org/wiki/ROS/Tutorials/CreatingMsgAndSrv ros.org/wiki/ROS/Tutorials/WritingPublisherSubscriber%28c%2B%2B%29