環境

  • conda 4.6.14
  • python 3.6.6
  • Xubuntu 18.04

やりたいこと

PyPIに登録した自作パッケージをcondaパッケージに変換して、condaに登録したいです。

実施したこと

以下のサイトを参考にして、condaパッケージの作成を試みました。
https://qiita.com/iisaka51/items/5828a50744be209705d0

meta.yamlの作成

$ conda skeletonコマンドを実行して、meta.yamlを生成しました。
meta.yamlの中身（一部）は以下の通りです。

requirements:
  host:
    - backoff
    - pip
    - python
    - python-dateutil
    - requests
  run:
    - backoff
    - python
    - python-dateutil
    - requests

conda buildの実行

$ conda buildを実行したら、以下のエラーが発生しました。

Leaving build/test directories:
  Work:
 /home/vagrant/miniconda3/conda-bld/work 
  Test:
 /home/vagrant/miniconda3/conda-bld/test_tmp 
Leaving build/test environments:
  Test:
source activate  /home/vagrant/miniconda3/conda-bld/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_ 
  Build:
source activate  /home/vagrant/miniconda3/conda-bld/_build_env 


Traceback (most recent call last):
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/environ.py", line 753, in get_install_actions
    actions = install_actions(prefix, index, specs, force=True)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/common/io.py", line 88, in decorated
    return f(*args, **kwds)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/plan.py", line 473, in install_actions
    txn = solver.solve_for_transaction(prune=prune, ignore_pinned=not pinned)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 107, in solve_for_transaction
    force_remove, force_reinstall)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 145, in solve_for_diff
    force_remove)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 242, in solve_final_state
    ssc = self._run_sat(ssc)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/common/io.py", line 88, in decorated
    return f(*args, **kwds)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/core/solve.py", line 475, in _run_sat
    conflicting_specs = ssc.r.get_conflicting_specs(tuple(final_environment_specs))
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/resolve.py", line 852, in get_conflicting_specs
    reduced_index = self.get_reduced_index(specs)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/common/io.py", line 88, in decorated
    return f(*args, **kwds)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/resolve.py", line 356, in get_reduced_index
    specs, features = self.verify_specs(specs)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda/resolve.py", line 244, in verify_specs
    raise ResolvePackageNotFound(bad_deps)
conda.exceptions.ResolvePackageNotFound: 
  - backoff

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "miniconda3/bin/conda-build", line 11, in <module>
    sys.exit(main())
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/cli/main_build.py", line 456, in main
    execute(sys.argv[1:])
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/cli/main_build.py", line 447, in execute
    verify=args.verify, variants=args.variants)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/api.py", line 208, in build
    notest=notest, need_source_download=need_source_download, variants=variants)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/build.py", line 2314, in build_tree
    notest=notest,
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/build.py", line 1324, in build
    output_metas = expand_outputs([(m, need_source_download, need_reparse_in_env)])
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/render.py", line 735, in expand_outputs
    for (output_dict, m) in _m.copy().get_output_metadata_set(permit_unsatisfiable_variants=False):
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/metadata.py", line 2038, in get_output_metadata_set
    bypass_env_check=bypass_env_check)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/metadata.py", line 721, in finalize_outputs_pass
    permit_unsatisfiable_variants=permit_unsatisfiable_variants)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/render.py", line 509, in finalize_metadata
    exclude_pattern)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/render.py", line 393, in add_upstream_pins
    permit_unsatisfiable_variants, exclude_pattern)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/render.py", line 359, in _read_upstream_pin_files
    permit_unsatisfiable_variants=permit_unsatisfiable_variants)
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/render.py", line 143, in get_env_dependencies
    channel_urls=tuple(m.config.channel_urls))
  File "/home/vagrant/miniconda3/lib/python3.7/site-packages/conda_build/environ.py", line 755, in get_install_actions
    raise DependencyNeedsBuildingError(exc, subdir=subdir)
conda_build.exceptions.DependencyNeedsBuildingError: Unsatisfiable dependencies for platform linux-64: {'backoff'}

エラー内容

linux-64環境で、backoffモジュールの依存関係が正しくないそうです。
conda_build.exceptions.DependencyNeedsBuildingError: Unsatisfiable dependencies for platform linux-64: {'backoff'}

質問

backoffモジュールはcondaに登録されていましたが、PyPIでのバージョンが1.8.0なのに対して、linux-x64のバージョンは1.6.0でした。

https://anaconda.org/conda-forge/backoff
画像の説明をここに入力

上記のエラーを解決するには、どのように対応すればよいでしょうか？