Hi Fredrik, As you see below the state of my system  before my reconfigure. last guix pull : Generation 5    *Jun 30 2019 15:39:18 *   (current)  guix 5dd0269     repository URL: https://git.savannah.gnu.org/git/guix.git     branch: master     commit: 5dd0269244da42066133d19055c9eb82b9e9ae20 Last reconfigure : Generation 6   *Jul 01 2019 00:19:25*    (current)   file name: /var/guix/profiles/system-6-link   canonical file name: /gnu/store/yq8ww08f2sh5277hw081ycsyhg5i4qid-system   label: GNU with Linux-Libre 5.1.15   bootloader: grub   root device: UUID: 2cab8a75-2dbf-4d03-afb0-58377abeee0e   kernel: /gnu/store/mxnxz8n6hdm6dndw8biqqqzblrmvc4ia-linux-libre-5.1.15/bzImage Yesterday when i launch a reconfigure . guix download app and rebuild webkitgtk -2.2.24  on my laptop this take several hours --> generation 7.. After  create the new generation when i launch an another reconfigure all work fine..  --> generation 8 And now it work fine. Thank you Regards Pierre On 7/10/19 11:35 PM, Fredrik Salomonsson wrote: > Hi Pierre, > > Den ons 10 juli 2019 kl 12:17 skrev Pirboazo >: > > Hello Everybody, > > I want add an user on my system but not update all packages. > > An user on on IRC channel #guix said me : > > > just use the same commit as you did when you last reconfigured with > the modified config.scm's only change in the users section > > I don't understand how to launch reconfigure with the same commit. > > i understand  to change the commit , i must use the command :  > guix pull > > If i don't modify the commit > > How  it'spossible than the command *guix system reconfigure* > launch the > build of a new configuration. > > Thank for your help. > > Pierre > > > It is as simple as running > `guix system reconfigure /path/to/config.scm`. > > That will reconfigure your os using the config file based on the current > commit of guix. > > Only way to change the commit, as you said, is `guix pull`. > > Which is why when updating Guix System. You first run `guix pull`, to > get new versions of packages etc. Then `guix system reconfigure` to > reconfigure your os based on that commit. > > I hope that clears it up. > -- > s/Fred[re]+i[ck]+/Fredrik/g