Hi Konrad, I get the same error as you. And for more versions than the only one your tested. For instance, for these commits,
* substitutes and rebuilds 923dcc3597 Fri Jan 14 12:59:33 2022 +0100 gnu: iverilog: Update to 11.0. 79ca578182 Thu Nov 11 21:52:08 2021 -0500 gnu: fpc: Fix build. ab0cf06244 Thu Nov 11 13:35:51 2021 -0500 gnu: rust: Remove #:rust ,rust-1.52 arguments. bbd2864272 Sun Dec 27 15:50:08 2020 +0100 gnu: openblas: Update to 0.3.13. * substitutes but failed rebuilds (--no-grafts --check) 4b1538e6ef Thu Nov 11 12:18:37 2021 -0500 gnu: kexec-tools: Fix build on i686-linux. ade7638d84 Fri Sep 18 14:05:51 2020 +0200 Revert "gnu: openblas: Update to 0.3.10." c59e9f0a03 Fri Sep 18 08:57:48 2020 +0200 gnu: openblas: Update to 0.3.10 5969598149 Sat Mar 7 12:48:18 2020 +0100 gnu: openblas: Use HTTPS home page. 2ea095300a Tue Oct 8 21:23:06 2019 +0200 gnu: OpenBLAS: Update to 0.3.7. * no substitute and failed builds a4384dc970 Tue Oct 8 21:23:06 2019 +0200 gnu: OpenBLAS: Incorporate grafted changes. ba05be2249 Fri Sep 13 10:50:11 2019 +0200 gnu: openblas: Set 'NUM_THREADS'. 5855756c81 Thu Feb 21 22:04:48 2019 -0600 gnu: openblas: Honor parallel-job-count. 602a5ef9f3 Sun Feb 10 21:04:23 2019 +0100 gnu: OpenBLAS: Update to 0.3.5. Last, note that the time-machine is failing earlier for these commits: d26584fcda Thu Nov 11 12:18:37 2021 -0500 gnu: binutils-gold: Inherit from binutils-next. ac6f677249 Thu Nov 11 12:18:37 2021 -0500 gnu: Add binutils-next. 661b25a2ed Thu Nov 11 12:18:36 2021 -0500 gnu: openblas: Do not build static library. 9e497f44ba Thu Nov 11 12:18:36 2021 -0500 gnu: openblas: Add support for older x86 processors. bd771edd6c Thu Nov 11 12:18:31 2021 -0500 gnu: openblas: Update to 0.3.18 e364758d44 Fri Sep 18 22:26:33 2020 +0200 gnu: openblas: Update to 0.3.10 df5a2e4f83 Thu Mar 5 23:36:05 2020 +0100 gnu: OpenBLAS: Update to 0.3.9 087c94019d Sat Feb 15 22:02:56 2020 +0100 gnu: OpenBLAS: Update to 0.3.8. e77412362f Sat May 4 16:25:53 2019 +0200 gnu: OpenBLAS: Update to 0.3.6. which reduces the range for testing. This bug#51536 is discussing reproducibility of openblas and the compilation flags. 1: <https://issues.guix.gnu.org/51536> Cheers, simon
