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spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Spam-Score: -3.03 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=gmail.com header.s=20210112 header.b="J7mrrFd/"; dmarc=fail reason="SPF not aligned (relaxed)" header.from=gmail.com (policy=none); spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org" X-Migadu-Queue-Id: 02DA7100A4 X-Spam-Score: -3.03 X-Migadu-Scanner: scn0.migadu.com X-TUID: fpDRDO2BeBZ2 After looking into what I think was core-updates(-frozen), I am running into a wall in the form of glib-networking, which blocks my attempts to build Calibre on many commits. However, I did find another merge which may be of interest: b029be2ee0f81cdcbc14240ff426408085ab0a40. One side of it, ffb381856d0c6cc1a557b789f6b377cfa17002a0, contains a working version of Calibre 5.21. I can't verify that the other side fails due to the mentioned glib-networking blocker. However, the common ancestor of the commits in question is 8b1bde7bb3936a64244824500ffe60f123704437, which has an older but still working version of Calibre: 5.14. I'm out of ideas for the moment: The differences in the Calibre recipe between branches are very small, but I don't know how to bisect here more effectively, get the core-updates-frozen commits to build, or dig into the Python build process.