bug#25884: build fails

[Catonano <catonano@gmail.com>]

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Guix master won't build

I just pulled master and I'm at
5d79b1bf575139dba9b3f919c7cc7b7f0853a67c

Attached is a file containing the last part of the log ("uscita dalla
directory" means 'exit from directory')

I'm building on GuixSD

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  LOAD     (guix scripts build)
  LOAD     (guix scripts archive)
  LOAD     (guix scripts import)
  LOAD     (guix scripts package)
;;; Failed to autoload protobuf in (gnu packages protobuf):
;;; ERROR: Unbound variable: python-build-system
  LOAD     (guix scripts gc)
  LOAD     (guix scripts hash)
  LOAD     (guix scripts pull)
  LOAD     (guix scripts substitute)
  LOAD     (guix scripts authenticate)
  LOAD     (guix scripts refresh)
Backtrace:
In unknown file:
   ?: 19 [primitive-load-path "guix/scripts/refresh" ...]
In ice-9/eval.scm:
 505: 18 [#<procedure 9725c0 at ice-9/eval.scm:499:4 (exp)> (define-module # # ...)]
In ice-9/psyntax.scm:
1106: 17 [expand-top-sequence ((define-module # # # ...)) () ((top)) ...]
 989: 16 [scan ((define-module (guix scripts refresh) #:use-module ...)) () ...]
 279: 15 [scan ((#(syntax-object let # ...) (#) (# #) ...)) () ...]
In ice-9/eval.scm:
 411: 14 [eval # ()]
In ice-9/boot-9.scm:
2954: 13 [define-module* (guix scripts refresh) #:filename ...]
2929: 12 [resolve-imports (((guix ui)) ((guix hash)) ((guix scripts)) ...)]
2867: 11 [resolve-interface (gnu packages commencement) #:select ...]
2792: 10 [#<procedure a26200 at ice-9/boot-9.scm:2780:4 (name #:optional autoload version #:key ensure)> # ...]
3068: 9 [try-module-autoload (gnu packages commencement) #f]
2404: 8 [save-module-excursion #<procedure 859eba0 at ice-9/boot-9.scm:3069:17 ()>]
3088: 7 [#<procedure 859eba0 at ice-9/boot-9.scm:3069:17 ()>]
In unknown file:
   ?: 6 [primitive-load-path "gnu/packages/commencement" ...]
In ice-9/eval.scm:
 453: 5 [eval # ()]
 387: 4 [eval # ()]
 387: 3 [eval # #]
 387: 2 [eval # #]
 393: 1 [eval # #]
In unknown file:
   ?: 0 [memoize-variable-access! #<memoized gcc> #<directory # 88c2f30>]

ERROR: In procedure memoize-variable-access!:
ERROR: Unbound variable: gcc
make[2]: *** [Makefile:4925: make-go] Error 1
make[2]: uscita dalla directory "/home/catonano/projects/guix-hacks"
make[1]: *** [Makefile:4068: all-recursive] Error 1
make[1]: uscita dalla directory "/home/catonano/projects/guix-hacks"
make: *** [Makefile:2724: all] Error 2
me@my-machhine ~/projects/guix-hacks [env]$