On Fri, Nov 02, 2018 at 03:05:16AM +0100, brettg@posteo.net wrote:
> The sha256 has for bzip2 is mismatching on build.

Can you give more details? For example, the version of Guix you are
using (`guix describe`), the command you ran, and the command's output?

It's working for me:

$ guix describe
Generation 43	Nov 01 2018 13:58:41	(current)
  guix 361dd8a
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 361dd8a55644be6ee81f3ccd9e55d2951a8693f8
$ guix build --no-grafts -S bzip2 --no-substitutes            
The following derivation will be built:                
   /gnu/store/bp0hyahbn3f60b954rfcz0vqlmc7lhzj-bzip2-1.0.6.tar.gz.drv
building /gnu/store/bp0hyahbn3f60b954rfcz0vqlmc7lhzj-bzip2-1.0.6.tar.gz.drv...

Starting download of /gnu/store/bjpalrv9f49d2k40p7ga0y6dwdys9w5j-bzip2-1.0.6.tar.gz
From https://web.archive.org/web/20180624184806/http://www.bzip.org/1.0.6/bzip2-1.0.6.tar.gz...
following redirection to `https://web.archive.org/web/20180624184835/http://www.bzip.org/1.0.6/bzip2-1.0.6.tar.gz'...
downloading from https://web.archive.org/web/20180624184806/http://www.bzip.org/1.0.6/bzip2-1.0.6.tar.gz...
 bzip2-1.0.6.tar.gz                                                                                                                                          129KiB/s 00:06 | 764KiB transferred
successfully built /gnu/store/bp0hyahbn3f60b954rfcz0vqlmc7lhzj-bzip2-1.0.6.tar.gz.drv
/gnu/store/bjpalrv9f49d2k40p7ga0y6dwdys9w5j-bzip2-1.0.6.tar.gz