On 10/20/25 10:32, Dennis Putnam via Mailman-users wrote:
I'm trying to install the web UI for mailman3. I am getting the following failure. Can someone help? TIA.
(venv) mailman :~$ pip install mailman-web mailman-hyperkitty ... FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pip-install-y364_cvm/cmarkgfm_9fcba25730114ac4a08d1e 7733112a45/src/cmarkgfm/cmark.cffi.h' [end of output]
note: This error originates from a subprocess, and is likely not a problem with pip. error: subprocess-exited-with-error
× Getting requirements to build wheel did not run successfully. │ exit code: 1 ╰─> See above for output.
note: This error originates from a subprocess, and is likely not a problem with pip.
I think I've seen a similar error, but I don't recall what I did to work around it. In this case cmarkgfm is a dependency of readme_renderer which in turn is a dependency of postorius. In your venv try
pip install cmarkgfm
first and then
pip install mailman-web mailman-hyperkitty
That may avoid this.
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