The following derivation will be built:
   /gnu/store/xnh8mmb31pgy69i7r75agc831xcpk9hk-guix-latest.drv
building path(s) `/gnu/store/wbs21mjkx15ar9p0wz060j0sprmgj6pm-guix-latest'
copying and compiling to '/gnu/store/wbs21mjkx15ar9p0wz060j0sprmgj6pm-guix-latest'...
loading...       24.6% of 589 filesrandom seed for tests: 1493578660
loading...       88.3% of 589 filesBacktrace:
In ice-9/boot-9.scm:
  66: 19 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 18 [eval # #]
In ice-9/boot-9.scm:
2412: 17 [save-module-excursion #<procedure 8e67c0 at ice-9/boot-9.scm:4084:3 ()>]
4089: 16 [#<procedure 8e67c0 at ice-9/boot-9.scm:4084:3 ()>]
1734: 15 [%start-stack load-stack #<procedure 8f6c60 at ice-9/boot-9.scm:4080:10 ()>]
1739: 14 [#<procedure 8f86c0 ()>]
In unknown file:
   ?: 13 [primitive-load "/gnu/store/22acg4czgn9ifcy1lclzfrh09fm0aklc-guix-latest-builder"]
In ./guix/build/pull.scm:
  57: 12 [build-guix "/gnu/store/wbs21mjkx15ar9p0wz060j0sprmgj6pm-guix-latest" ...]
 123: 11 [#<procedure c64280 at ./guix/build/pull.scm:57:2 ()>]
In ice-9/boot-9.scm:
2900: 10 [resolve-interface (gnu packages web-browsers) #:select ...]
2825: 9 [#<procedure 84ef20 at ice-9/boot-9.scm:2813:4 (name #:optional autoload version #:key ensure)> # ...]
3101: 8 [try-module-autoload (gnu packages web-browsers) #f]
2412: 7 [save-module-excursion #<procedure 4056d80 at ice-9/boot-9.scm:3102:17 ()>]
3121: 6 [#<procedure 4056d80 at ice-9/boot-9.scm:3102:17 ()>]
In unknown file:
   ?: 5 [primitive-load-path "gnu/packages/web-browsers" ...]
In ice-9/eval.scm:
 432: 4 [eval # ()]
 453: 3 [eval # ()]
 411: 2 [eval # #]
 393: 1 [eval #<memoized glib-or-gtk-build-system> (# "3.6" "netsurf" . #)]
In unknown file:
   ?: 0 [memoize-variable-access! # #]

ERROR: In procedure memoize-variable-access!:
ERROR: Unbound variable: glib-or-gtk-build-system