How do I make catkin_make check for required python modules?

edit

I would like for catkin_make to fail if a fellow developer does not have all of the required python modules installed. I thought that I could do this using the package.xml manifest, but I may just be doing something wrong.

I would like to make sure that another developer has the python "requests" module installed on their system, but it could be any other non-standard python module from apt-get or pip.

Am I on the right track? Should I try to add something to CMakeLists.txt to get this behavior?

Here's a snippet of my package.xml file:

<?xml version="1.0"?>
<package>
  <name>awesome</name>
  <buildtool_depend>catkin</buildtool_depend>

  <build_depend>rospy</build_depend>
  <build_depend>std_msgs</build_depend>
  <build_depend>actionlib</build_depend>

  <run_depend>rospy</run_depend>
  <run_depend>std_msgs</run_depend>
  <run_depend>actionlib</run_depend>
  <run_depend>roslib</run_depend>

  <run_depend>os</run_depend>
  <run_depend>sys</run_depend>
  <run_depend>json</run_depend>
  <run_depend>yaml</run_depend>
  <run_depend>uuid</run_depend>
  <run_depend>boto3</run_depend>
  <run_depend>zipfile</run_depend>
  <run_depend>threading</run_depend>
  <run_depend>requests</run_depend>
</package>