Failed to set up the build environment for…

[Alex Sassmannshausen <alex.sassmannshausen@gmail.com>]

Hello,

I've just run a clean install of Guix from Git, thus using the new store
location (/gnu/) and the updated nix daemon. I configured the system as
required (change permissions on store, create per-user dir, add
build-users, etc). I then ran:
$ guix package -i hello

All works as expected (substituting the required binaries etc.) until
the 'module-import' build stage, where I get the following error:
-----
@ build-started /gnu/store/byc1s5m1zfyxjhkwcj7j6226i459zbwa-module-import.drv - i686-linux /usr/local/var/log/guix/drvs/by//c1s5m1zfyxjhkwcj7j6226i459zbwa-module-import.drv.bz2
guix package: error: build failed: failed to set up the build environment for `/gnu/store/byc1s5m1zfyxjhkwcj7j6226i459zbwa-module-import.drv'
-----

In the log refreference, you can see '/gnu/store/byc1s5…' and
'…/drvs/by//c1s5….'.  In the error message you can then see
`/gnu/store/byc1s5m…'.

It looks as though some path truncation takes place here. Any ideas as
to what might be happening here or further tests I could do that might
shed some light?

Cheers,
Alex