Hello Philippe, 
I am working to fix it in a larger effort to write a Scalasca recipe (which needs Score-P, which needs Cube...). 
I have pushed some new Cube recipes here [ https://codeberg.org/guix/guix/pulls/102 | https://codeberg.org/guix/guix/pulls/102 ] , and you can find the Scalasca roadmap here [ https://codeberg.org/lcirrottola/guix/milestone/19626 | https://codeberg.org/lcirrottola/guix/milestone/19626 ] 

Feel free to comment / fix / criticize :-) 
Cheers, 
Luca