Not a surprise as long as some dependencies are built against libmpfr4.
It looks like all dependencies are now rebuilt against libmpfr6 but sagemath is
still failing.
https://buildd.debian.org/status/fetch.php?pkg=sagemath=amd64=8.1-2%2Bb2=1517950645=0
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debian-science-maintainers mailing
Processing control commands:
> block -1 by 888459 888911
Bug #888912 [src:sagemath] sagemath test failures with mpfr 4.0.0 and several
architectures
888912 was not blocked by any bugs.
888912 was not blocking any bugs.
Added blocking bug(s) of 888912: 888459 and 888911
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888912:
Package: src:sagemath
Version: 8.2-1
Severity: serious
Tags: sid buster
see https://buildd.debian.org/status/package.php?p=sagemath=unstable
test failures on every architecture.
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