WARNING: (guile-user): imported module (guix build utils) overrides core binding `delete' Backtrace: In ice-9/eval.scm: 217:50 19 (lp (# ?)) 217:50 18 (lp (# ?)) 217:50 17 (lp (# ?)) 217:50 16 (lp (# ?)) 217:50 15 (lp (# ?)) 217:50 14 (lp (# ?)) 217:50 13 (lp (# ?)) 217:50 12 (lp (# ?)) 217:50 11 (lp (# ?)) 217:50 10 (lp (# ?)) 217:50 9 (lp (# ?)) 217:50 8 (lp (# ?)) 217:50 7 (lp (# ?)) 217:50 6 (lp (# ?)) 217:50 5 (lp (# ?)) 217:33 4 (lp (# ?)) 202:51 3 (_ #f) 196:43 2 (_ #f) 223:20 1 (proc #) In unknown file: 0 (%resolve-variable (7 . %output) #) ERROR: In procedure %resolve-variable: Unbound variable: %output