> Pushed as 9d97a1b.  Since this changes the ABI, make sure to run
> ‘make clean && make’ after ‘git pull’.

Here is the output:

Backtrace:
In ice-9/eval.scm:
 411: 19 [eval # ()]
In ice-9/boot-9.scm:
2870: 18 [define-module* (gnu packages tcl) #:filename ...]
2845: 17 [resolve-imports ((#) (#) (#) (#) ...)]
2783: 16 [resolve-interface (gnu packages xorg) #:select ...]
2708: 15 [#<procedure a062ea0 at ice-9/boot-9.scm:2696:4 (name #:optional autoload version #:key ensure)> # ...]
2981: 14 [try-module-autoload (gnu packages xorg) #f]
2320: 13 [save-module-excursion #<procedure a751f60 at ice-9/boot-9.scm:2982:17 ()>]
3001: 12 [#<procedure a751f60 at ice-9/boot-9.scm:2982:17 ()>]
In unknown file:
   ?: 11 [primitive-load-path "gnu/packages/xorg" ...]
In gnu/packages/xorg.scm:
  19: 10 [#<procedure a3c5470 ()>]
In ice-9/boot-9.scm:
2870: 9 [define-module* (gnu packages xorg) #:filename ...]
2845: 8 [resolve-imports (# # # # ...)]
2783: 7 [resolve-interface (gnu packages glib) #:select ...]
2708: 6 [#<procedure a062ea0 at ice-9/boot-9.scm:2696:4 (name #:optional autoload version #:key ensure)> # ...]
2981: 5 [try-module-autoload (gnu packages glib) #f]
2320: 4 [save-module-excursion #<procedure a7559f0 at ice-9/boot-9.scm:2982:17 ()>]
3001: 3 [#<procedure a7559f0 at ice-9/boot-9.scm:2982:17 ()>]
In unknown file:
   ?: 2 [primitive-load-path "gnu/packages/glib" ...]
In gnu/packages/glib.scm:
 146: 1 [#<procedure a77cbc0 ()>]
In ice-9/boot-9.scm:
 106: 0 [#<procedure a194360 at ice-9/boot-9.scm:97:6 (thrown-k . args)> unbound-variable ...]

ice-9/boot-9.scm:106:20: In procedure #<procedure a194360 at ice-9/boot-9.scm:97:6 (thrown-k . args)>:
ice-9/boot-9.scm:106:20: In procedure module-lookup: Unbound variable: perl-xml-parser
make[2]: *** [gnu/packages/fontutils.go] Error 1
make[2]: Leaving directory `/home/guix'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/guix'
make: *** [all] Error 2