code: def add_requirement_libs_from(self, req_libs, platforms=None):
      
      reqs = [req for req_lib in req_libs for req in req_lib.requirements]
      self.add_resolved_requirements(reqs, platforms=platforms)
docs: Multi-platform dependency resolution for PEX files.
  
      :param builder: Dump the requirements into this builder.
      :param interpreter: The :class:`PythonInterpreter` to resolve requirements for.
      :param req_libs: A list of :class:`PythonRequirementLibrary` targets to resolve.
      :param log: Use this logger.
      :param platforms: A list of :class:`Platform`s to resolve requirements for.
                        Defaults to the platforms specified by PythonSetup.