Am Samstag, 15. Dezember 2012 schrieb Ludovic Courtès:
> Commit 335dd76 disables substituters.  We’ll re-enable them once it’s
> actually (re)implemented.  :-)

Nice!

> > The next error message is
> > @ build-started /nix/store/6q7s15hqyqxkxnxxx1d7jj2rm6q28ib9-module-
> > import.drv /nix/store/fdzwc7ss7zbpg60n5h2kpp98l8sbjx9f-module-import
> > x86_64-linux /usr/local/guix-
> > git/var/log/nix/drvs/6q7s15hqyqxkxnxxx1d7jj2rm6q28ib9-module-import.dr
> > v.bz2 error: build failed: all build users are currently in use;
> > consider creating additional users and adding them to the `nixbld'
> > group
> > although I just started the guix daemon and there are 10 users in the
> > group nixbld.
> Hmm, can you try running guix-daemon with the newly-added ‘--debug’
> option?

Not much to see. Here is the output:
acquiring global GC lock `/usr/local/guix-git/var/nix/gc.lock'
acquiring read lock on `/usr/local/guix-git/var/nix/temproots/29720'
acquiring write lock on `/usr/local/guix-git/var/nix/temproots/29720'
downgrading to read lock on `/usr/local/guix-git/var/nix/temproots/29720'
... (the last two lines 1918 times)
the following derivations will be built:
    /nix/store/rqllv82x33mfqvma7zbj2kjdkxdqdwpx-hello-2.8.drv
...
@ build-started /nix/store/6q7s15hqyqxkxnxxx1d7jj2rm6q28ib9-module-
import.drv /nix/store/fdzwc7ss7zbpg60n5h2kpp98l8sbjx9f-module-import 
x86_64-linux /usr/local/guix-
git/var/log/nix/drvs/6q7s15hqyqxkxnxxx1d7jj2rm6q28ib9-module-import.drv.bz2
error: build failed: all build users are currently in use; consider 
creating additional users and adding them to the `nixbld' group

I deleted /usr/local/guix-git/var/ and tried again
   ./pre-inst-env guix-build hello

The result is more varied, I am attaching it in case it is of any use.

Andreas