From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp2 ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id uARuG1e8PGBNJAAA0tVLHw (envelope-from ) for ; Mon, 01 Mar 2021 10:05:11 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp2 with LMTPS id qCg7F1e8PGBMOgAAB5/wlQ (envelope-from ) for ; Mon, 01 Mar 2021 10:05:11 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id 35D9527FC8 for ; Mon, 1 Mar 2021 11:05:10 +0100 (CET) Received: from localhost ([::1]:52334 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lGfQL-0002y5-Cs for larch@yhetil.org; Mon, 01 Mar 2021 05:05:09 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:38418) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lGfQE-0002xy-FY for bug-guix@gnu.org; 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I see this: --8<---------------cut here---------------start------------->8--- $ guix build openjdk -n 369.8 MB would be downloaded: /gnu/store/676kcvxnnjfcy960fy4xkr10fbn3ciay-openjdk-14.0-doc /gnu/store/dk8rkrfkdgsmy1a33n0sc39fhqggy1nh-openjdk-14.0-jdk /gnu/store/ylakfs5fwq5sqsk5zbkwwf2d1lp0jfxs-openjdk-14.0 $ guix build openjdk@13 -n 358.0 MB would be downloaded: /gnu/store/hipy0g8zpnicqcwhx5ygx9fmmkbgbw6w-openjdk-13.0-doc /gnu/store/ff9nn7ipbpnrrvsg0djdrzm0a8v1jx5j-openjdk-13.0-jdk /gnu/store/nb6p8aqjjw923vwd7safbh0w5q3mr9fq-openjdk-13.0 $ guix size openjdk@14 | grep openjdk /gnu/store/ylakfs5fwq5sqsk5zbkwwf2d1lp0jfxs-openjdk-14.0 389.3 = 295.8 76.0% $ guix describe Generacio 175 Feb 04 2021 22:52:40 (nuna) guix 5ae09d7 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: 5ae09d7979a0696d862b9555314eab199f7ce576 --8<---------------cut here---------------end--------------->8--- What this shows is that the compiled openjdk 14 does not depend on previous versions; likewise for version 13. So the long dependency chain is a built-time-only dependency chain. It=E2=80=99s a problem when building from source but not when using substit= utes. Ludo=E2=80=99.