ROS environment setup

["Dino H." <oss@hllmnn.de>]

Hi,

I installed ROS from the official Stretch sources. However, I'm not able 
to use it since the environment is not set up correctly. For example, if 
I try to do

catkin_create_pkg test roscpp

I get the following error: catkin_create_pkg: error: argument 
--rosdistro is required

Is there a setup script corresponding to 
/opt/ros/${ROS_DISTRO}/setup.bash that sets all required environment 
variables, like ROS_DISTRO, ROS_MASTER_URI etc.?
There are some related scripts in /etc/catkin/profile.d, but how are 
those invoked?

Best
Dino