Hi Adrian I believe there has been some mixing with the bugs here. Bug #975834 [0] is not a duplicate of #976569 [1] and should not have been merged.
I believe #975834 was a problem with CMake in python-blosc, which was fixed in version 1.9.2+ds1-2 with this commit [2]. The bug #975834 happened when c-blosc was still at version 1.17.1+ds1-1. Bug #976569 happened when c-blosc was updated to 1.20.1+ds1-1 and got compiled without snappy support. which is the reason for the bug. Regards, Håvard [0] https://bugs.debian.org/cgi-bin/#975834 [1] https://bugs.debian.org/cgi-bin/#976569 [2] https://salsa.debian.org/python-team/packages/python-blosc/-/commit/8e961cd6ae1c82eed6170a6683acb209fb08714a