Hey Maxime,

Thank you for reviewing and your helpful tips!

Here is a second version, I hope it's better.

I dont know how to test cross compiling, though (on a x86_64 system):

./pre-inst-env guix build --system=aarch64-linux go-ipfs
[...]
building /gnu/store/ssvif7gdgv7xn7jmgmcp4ws71fgmwn5x-go-ipfs-0.11.0.drv...
;;; Stat of /tmp/guix-build-go-ipfs-0.11.0.drv-0/guile failed:
;;; In procedure stat: No such file or directory: "/tmp/guix-build-go-ipfs-0.11.0.drv-0/guile"
Backtrace:
           0 (primitive-load "/tmp/guix-build-go-ipfs-0.11.0.drv-0/g?")

ERROR: In procedure primitive-load:
In procedure open-file: No such file or directory: "/tmp/guix-build-go-ipfs-0.11.0.drv-0/guile"

And then I'm completely lost and confused. ;)