old_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
  
  import specs.folly as folly
  import specs.fizz as fizz
  import specs.sodium as sodium
  import specs.wangle as wangle
  
  
  def fbcode_builder_spec(builder):
      return {
          'depends_on': [folly, wangle, fizz, sodium],
          'steps': [
              builder.fb_github_autoconf_install('proxygen/proxygen'),
          ],
      }
  
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
  
  import specs.folly as folly
  import specs.fizz as fizz
  import specs.mvfst as mvfst
  import specs.sodium as sodium
  import specs.wangle as wangle
  import specs.zstd as zstd
  
  
  def fbcode_builder_spec(builder):
      builder.add_option(
          'proxygen/proxygen:cmake_defines',
          {
              'BUILD_QUIC': 'ON',
          }
      )
      return {
          'depends_on': [folly, wangle, fizz, sodium, zstd, mvfst],
          'steps': [
              # CMake build with QUIC/HTTP3
              builder.fb_github_cmake_install(
                  'proxygen/proxygen', '..'),
              # Legacy build with no QUIC/HTTP3
              builder.fb_github_autoconf_install('proxygen/proxygen'),
          ],
      }
  
subject: enable CMake build (with HTTP/3)