new_contents: #!/usr/bin/env python
  # Copyright (c) Facebook, Inc. and its affiliates.
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  
  
  def fbcode_builder_spec(builder):
      builder.add_option('fmtlib/fmt:git_hash', '5.3.0')
      return {
          'steps': [
              builder.github_project_workdir('fmtlib/fmt', 'build'),
              builder.cmake_install('fmtlib/fmt'),
          ],
      }
  
subject: Add fmt to Folly's open-source dependencies