new_contents: from .check_output import check_output
  import json
  
  _capabilities = None
  
  def capabilities(key):
      global _capabilities
      if _capabilities is None:
          try:
              _capabilities = json.loads(check_output("cmake -E capabilities"))
          except Exception as e:
              print("CMakeBuilder: Error: Could not load cmake's capabilities")
              _capabilities = {"error": None}
      return _capabilities.get(key, None)
  
subject: Add capabilities file