Thank you for quick fix Bruno! I'll use host-cpu-c-abi.m4 serial 19 and somehow make the Debian packaging of guile-fibers 1.3.1 use it. I think host-cpu-c-abi.m4 should be added to upstream guile-fibers m4/ too, and will try to work on that (they could use gnulib-tool and/or bootstrap but I'll propose a small fix first).
/Simon
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