metapackage TypeError

[zeneofa]

I am trying to create a metapackage for a set of system libraries, so that other packages that depend on these libraries use the system ones instead of a conda associated one. I am running into a TypeError. Not sure if I am doing something wrong, just being an idiot, or if there is something I am missing? Any advice or help would be greatly appreciated.

Some system specifics: conda-build 3.18.11 Python 3.7.3 conda 4.8.2

  Operating System: elementary OS 5.1 Hera
            Kernel: Linux 5.0.0-37-generic
      Architecture: x86-64

Actual Behavior

(base) zen@elysium:~/work/conda-recipes$ conda metapackage poppler 1.0
Adding in variants from internal_defaults
INFO:conda_build.variants:Adding in variants from internal_defaults
No numpy version specified in conda_build_config.yaml.  Falling back to default numpy value of 1.11
WARNING:conda_build.metadata:No numpy version specified in conda_build_config.yaml.  Falling back to default numpy value of 1.11
Traceback (most recent call last):
  File "/home/zen/miniconda3/bin/conda-metapackage", line 11, in <module>
    sys.exit(main())
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/cli/main_metapackage.py", line 125, in main
    return execute(sys.argv[1:])
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/cli/main_metapackage.py", line 121, in execute
    api.create_metapackage(channel_urls=channel_urls, **args.__dict__)
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/api.py", line 376, in create_metapackage
    license_name=license_name, summary=summary, config=config)
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/metapackage.py", line 29, in create_metapackage
    return build(m, config=config, need_source_download=False)
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/api.py", line 209, in build
    notest=notest, need_source_download=need_source_download, variants=variants)
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/build.py", line 2344, in build_tree
    notest=notest,
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/build.py", line 1335, in build
    output_metas = expand_outputs([(m, need_source_download, need_reparse_in_env)])
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/render.py", line 746, in expand_outputs
    for (output_dict, m) in _m.copy().get_output_metadata_set(permit_unsatisfiable_variants=False):
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/metadata.py", line 2016, in get_output_metadata_set
    render_order = toposort(out_metadata_map)
  File "/home/zen/miniconda3/lib/python3.7/site-packages/conda_build/metadata.py", line 638, in toposort
    output_m.get_value('requirements/host', [])]
TypeError: can only concatenate tuple (not "list") to tuple

Expected Behavior

I was expecting a metapackage recipe to be created.

Output of conda info

    active env location : /home/zen/miniconda3
            shell level : 1
       user config file : /home/zen/.condarc
 populated config files : 
          conda version : 4.8.2
    conda-build version : 3.18.11
         python version : 3.7.3.final.0
       virtual packages : __glibc=2.27
       base environment : /home/zen/miniconda3  (writable)
           channel URLs : https://repo.anaconda.com/pkgs/main/linux-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/linux-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /home/zen/miniconda3/pkgs
                          /home/zen/.conda/pkgs
       envs directories : /home/zen/miniconda3/envs
                          /home/zen/.conda/envs
               platform : linux-64
             user-agent : conda/4.8.2 requests/2.22.0 CPython/3.7.3 Linux/5.0.0-37-generic elementary/5.1 glibc/2.27
                UID:GID : 1000:1000
             netrc file : None
           offline mode : False

[github-actions[bot]]

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