Hi. I tried a few things based on your branch at <https://github.com/r0man/guix/tree/clog>, but I couldn't get clog/tools to build correctly. I wonder why it says it can't find the clog system, as the ASDF configuration indicating where to find it seems correct...
If the clog/tools system is not essential, you could send a simpler patch updating clog (and building clog/docs too), and hopefully we'll discover later where the issue with clog/tools comes from.
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