bug#49479: I found a bug

[Dietmar Schaefer]

guix pull: error: You found a bug: the program 
'/gnu/store/gq01q3gpbpf0kkkygdy97nskszv1nkw6-compute-guix-derivation'
failed to compute the derivation for Guix (version: 
"ef3d60fc7631ae117be1fd7096f0a568adb01c62"; system: "x86_64-linux";
host version: "1.3.0-1.771b866"; pull-version: 1).