rosdep basic usage

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Hi,

I have a couple packages that depend on python libraries ( one depends on rtklib and the other on mxnet)

My first question is do these belong in my package.yml file

  <build_depend>rtklib</build_depend>  
  <run_depend>rtklib</run_depend>

and

  <build_depend>mxnet</build_depend>  
  <run_depend>mxnet</run_depend>

I'm trying to get the hang of rosdep by doing a simpler example with pygame. I included

 <run_depend>pygame</run_depend>

in my package.yml and then ran rosdep install <my-package>

but I get the error:

ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies: rosdep_tutorial: Cannot locate rosdep definition for [pygame]

I also tried python_pygame but that did not work either

UPDATE:
Okay, I got my pygame example working by using python-pygame because I found out that rosdep is using the apt package manager. Now I'm stuck because neither rtklib or mxnet are able to be install via apt. How should these be installed?