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dkim=fail ("headers rsa verify failed") header.d=protonmail.com header.s=protonmail2 header.b=RHvNZvKs; dmarc=pass (policy=none) header.from=gnu.org; 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: 99E172BE4F X-Spam-Score: -3.63 X-Migadu-Scanner: scn1.migadu.com X-TUID: KzXDAXJZsjnF I haven't had the chance to see what is happening inside union-build yet, b= ut did confirm that propagating expat/fixed instead of expat does not have = the same problem. I tried with (define fontconfig-fixed (package (inherit fontconfig) (propagated-inputs (modify-inputs (package-propagated-inputs fontconfig) (replace "expat" (@@ (gnu packages xml) expat/fixed)))))) and then (fhs-union (list fontconfig-fixed)) did not have any broken links = trying to go to the wrong version. Using this also works around my original= problem of a multi-arch union build having collisions (so that seems to st= em from whatever is happening here).