Created temporary directory: /tmp/pip-ephem-wheel-cache-cnwxszyo
Created temporary directory: /tmp/pip-req-tracker-a_28gm8j
Created requirements tracker '/tmp/pip-req-tracker-a_28gm8j'
Created temporary directory: /tmp/pip-wheel-af170q8i
Collecting catkin-pkg==0.4.21
  1 location(s) to search for versions of catkin-pkg:
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  Getting page https://pypi.org/simple/catkin-pkg/
  Analyzing links from page https://pypi.org/simple/catkin-pkg/
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  Saved /tmp/tmpebra3uq_/catkin_pkg-0.4.21-py3-none-any.whl
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Skipping catkin-pkg, due to already being wheel.
Cleaning up...
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Removed build tracker '/tmp/pip-req-tracker-a_28gm8j'