The good news: all Next browser dependencies are now packaged under the
branch wip-nextbrowser.

The bad news: Next browser fails to build.

--8<---------------cut here---------------start------------->8---
; compiling file "/gnu/store/39vh5ghdn9x7zwb6ky7law678wkz20l2-next-browser-0.0.8-1.ccc289b/share/common-lisp/sbcl-source/next/gtk/next/source/document-mode.lisp" (written 10 OCT 2018 01:12:05 PM):
; compiling (IN-PACKAGE :NEXT)
; compiling (DEFVAR *DOCUMENT-MODE-MAP* ...)
; compiling (DEFCLASS DOCUMENT-MODE ...)
; compiling (DEFPARENSTATIC SCROLL-TO-TOP ...)
; compiling (DEFPARENSTATIC SCROLL-TO-BOTTOM ...)
; compiling (DEFPARENSTATIC SCROLL-DOWN ...)
; compiling (DEFPARENSTATIC SCROLL-UP ...)
; compiling (DEFPARENSTATIC SCROLL-LEFT ...)
; compiling (DEFPARENSTATIC SCROLL-RIGHT ...)
; compiling (DEFUN ENSURE-ZOOM-RATIO-RANGE ...)
; compiling (DEFPAREN %ZOOM-IN-PAGE ...)
; compiling (DEFINE-COMMAND ZOOM-IN-PAGE ...)
; compiling (DEFPAREN %ZOOM-OUT-PAGE ...)
; compiling (DEFINE-COMMAND ZOOM-OUT-PAGE ...)
; compiling (DEFPAREN %UNZOOM-PAGE ...)
; compiling (DEFINE-COMMAND UNZOOM-PAGE ...)
; compiling (DEFINE-COMMAND HISTORY-BACKWARDS ...)
; compiling (DEFINE-COMMAND HISTORY-FORWARDS ...)
; compiling (DEFUN HISTORY-FOWARDS-QUERY-COMPLETE ...)
; compiling (DEFINE-COMMAND HISTORY-FORWARDS-QUERY ...)
; compiling (DEFUN ADD-OR-TRAVERSE-HISTORY ...)
; compiling (DEFINE-COMMAND SET-URL-NEW-BUFFER ...)
; compiling (DEFUN SET-URL-BUFFER ...)
; compiling (DEFUN SET-URL-NEW-BUFFER ...)
; file: /gnu/store/39vh5ghdn9x7zwb6ky7law678wkz20l2-next-browser-0.0.8-1.ccc289b/share/common-lisp/sbcl-source/next/gtk/next/source/document-mode.lisp
; in: DEFUN SET-URL-NEW-BUFFER
;     (DEFUN NEXT::SET-URL-NEW-BUFFER
;            (NEXT::INPUT-URL &OPTIONAL NEXT::DISABLE-HISTORY)
;       (LET ((NEXT::NEW-BUFFER (NEXT::GENERATE-NEW-BUFFER "default" #)))
;         (NEXT::SET-VISIBLE-ACTIVE-BUFFER NEXT::NEW-BUFFER)
;         (NEXT::SET-URL-BUFFER NEXT::INPUT-URL NEXT::NEW-BUFFER
;          NEXT::DISABLE-HISTORY)))
; --> PROGN
; ==>
;   (EVAL-WHEN (:COMPILE-TOPLEVEL)
;     (SB-C:%COMPILER-DEFUN 'NEXT::SET-URL-NEW-BUFFER NIL T))
;
; caught WARNING:
;   Duplicate definition for SET-URL-NEW-BUFFER found in one file.
;   See also:
;     The ANSI Standard, Section 3.2.2.3

; compiling (DEFUN SETUP-URL ...)
; compiling (DEFUN SET-URL ...)
; compiling (DEFINE-COMMAND SET-URL-CURRENT-BUFFER ...)
; compiling (DEFINE-COMMAND SET-URL-FROM-BOOKMARK ...)
; compiling (DEFUN SETUP-ANCHOR ...)
; compiling (DEFINE-COMMAND GO-ANCHOR ...)
; compiling (DEFINE-COMMAND GO-ANCHOR-NEW-BUFFER ...)
; compiling (DEFINE-COMMAND GO-ANCHOR-NEW-BUFFER-FOCUS ...)
; compiling (DEFUN DOCUMENT-MODE ...)
; compiling (DEFMETHOD SETUP ...)

; /gnu/store/39vh5ghdn9x7zwb6ky7law678wkz20l2-next-browser-0.0.8-1.ccc289b/lib/sbcl/next/source/document-mode-tmpOPCILR65.fasl written
; compilation finished in 0:00:00.058
Unhandled UIOP/LISP-BUILD:COMPILE-FILE-ERROR in thread #<SB-THREAD:THREAD "main thread" RUNNING
                                                          {10005585B3}>:
  COMPILE-FILE-ERROR while compiling #<CL-SOURCE-FILE "next" "document-mode">

Backtrace for: #<SB-THREAD:THREAD "main thread" RUNNING {10005585B3}>
0: (SB-DEBUG::DEBUGGER-DISABLED-HOOK #<UIOP/LISP-BUILD:COMPILE-FILE-ERROR {1004DDACA3}> #<unused argument> :QUIT T)
1: (SB-DEBUG::RUN-HOOK *INVOKE-DEBUGGER-HOOK* #<UIOP/LISP-BUILD:COMPILE-FILE-ERROR {1004DDACA3}>)
2: (INVOKE-DEBUGGER #<UIOP/LISP-BUILD:COMPILE-FILE-ERROR {1004DDACA3}>)
3: (ERROR UIOP/LISP-BUILD:COMPILE-FILE-ERROR :CONTEXT-FORMAT "~/asdf-action::format-action/" :CONTEXT-ARGUMENTS ((#<ASDF/LISP-ACTION:COMPILE-OP > . #<ASDF/LISP-ACTION:CL-SOURCE-FILE "next" "document-mode">)))
4: (UIOP/LISP-BUILD:CHECK-LISP-COMPILE-RESULTS NIL T T "~/asdf-action::format-action/" ((#<ASDF/LISP-ACTION:COMPILE-OP > . #<ASDF/LISP-ACTION:CL-SOURCE-FILE "next" "document-mode">)))
5: ((SB-PCL::EMF ASDF/ACTION:PERFORM) #<unused argument> #<unused argument> #<ASDF/LISP-ACTION:COMPILE-OP > #<ASDF/LISP-ACTION:CL-SOURCE-FILE "next" "document-mode">)
6: ((LAMBDA NIL :IN ASDF/ACTION:CALL-WHILE-VISITING-ACTION))
7: ((:METHOD ASDF/ACTION:PERFORM-WITH-RESTARTS :AROUND (T T)) #<ASDF/LISP-ACTION:COMPILE-OP > #<ASDF/LISP-ACTION:CL-SOURCE-FILE "next" "document-mode">) [fast-method]
8: ((:METHOD ASDF/PLAN:PERFORM-PLAN (T)) #<ASDF/PLAN:SEQUENTIAL-PLAN {1002497DE3}>) [fast-method]
9: ((FLET SB-C::WITH-IT :IN SB-C::%WITH-COMPILATION-UNIT))
10: ((:METHOD ASDF/PLAN:PERFORM-PLAN :AROUND (T)) #<ASDF/PLAN:SEQUENTIAL-PLAN {1002497DE3}>) [fast-method]
11: ((:METHOD ASDF/OPERATE:OPERATE (ASDF/OPERATION:OPERATION ASDF/COMPONENT:COMPONENT)) #<ASDF/BUNDLE:COMPILE-BUNDLE-OP > #<ASDF/SYSTEM:SYSTEM "next/gtk"> :PLAN-CLASS NIL :PLAN-OPTIONS NIL) [fast-method]
12: ((SB-PCL::EMF ASDF/OPERATE:OPERATE) #<unused argument> #<unused argument> #<ASDF/BUNDLE:COMPILE-BUNDLE-OP > #<ASDF/SYSTEM:SYSTEM "next/gtk">)
13: ((LAMBDA NIL :IN ASDF/OPERATE:OPERATE))
14: ((:METHOD ASDF/OPERATE:OPERATE :AROUND (T T)) #<ASDF/BUNDLE:COMPILE-BUNDLE-OP > #<ASDF/SYSTEM:SYSTEM "next/gtk">) [fast-method]
15: ((SB-PCL::EMF ASDF/OPERATE:OPERATE) #<unused argument> #<unused argument> ASDF/BUNDLE:COMPILE-BUNDLE-OP "next/gtk")
16: ((LAMBDA NIL :IN ASDF/OPERATE:OPERATE))
17: ((:METHOD ASDF/OPERATE:OPERATE :AROUND (T T)) ASDF/BUNDLE:COMPILE-BUNDLE-OP "next/gtk") [fast-method]
18: (ASDF/SESSION:CALL-WITH-ASDF-SESSION #<CLOSURE (LAMBDA NIL :IN ASDF/OPERATE:OPERATE) {1002351FBB}> :OVERRIDE T :KEY NIL :OVERRIDE-CACHE T :OVERRIDE-FORCING NIL)
19: ((LAMBDA NIL :IN ASDF/OPERATE:OPERATE))
20: (ASDF/SESSION:CALL-WITH-ASDF-SESSION #<CLOSURE (LAMBDA NIL :IN ASDF/OPERATE:OPERATE) {1004329D1B}> :OVERRIDE NIL :KEY NIL :OVERRIDE-CACHE NIL :OVERRIDE-FORCING NIL)
21: ((:METHOD ASDF/OPERATE:OPERATE :AROUND (T T)) ASDF/BUNDLE:COMPILE-BUNDLE-OP "next/gtk") [fast-method]
22: (SB-INT:SIMPLE-EVAL-IN-LEXENV (ASDF/OPERATE:OPERATE (QUOTE ASDF/BUNDLE:COMPILE-BUNDLE-OP) "next/gtk") #<NULL-LEXENV>)
23: (EVAL (ASDF/OPERATE:OPERATE (QUOTE ASDF/BUNDLE:COMPILE-BUNDLE-OP) "next/gtk"))
24: (SB-IMPL::PROCESS-EVAL/LOAD-OPTIONS ((:EVAL . "(require :asdf)") (:EVAL . "(let ((*package* (find-package :asdf))) (load \"/gnu/store/39vh5ghdn9x7zwb6ky7law678wkz20l2-next-browser-0.0.8-1.ccc289b/share/common-lisp/sbcl-source/next/gtk/next/next.asd\"))") (:EVAL . "(asdf:operate (quote asdf:compile-bundle-op) \"next/gtk\")") (:QUIT)))
25: (SB-IMPL::TOPLEVEL-INIT)
26: ((FLET SB-UNIX::BODY :IN SAVE-LISP-AND-DIE))
27: ((FLET "WITHOUT-INTERRUPTS-BODY-27" :IN SAVE-LISP-AND-DIE))
28: ((LABELS SB-IMPL::RESTART-LISP :IN SAVE-LISP-AND-DIE))

unhandled condition in --disable-debugger mode, quitting
;
; compilation unit aborted
;   caught 1 fatal ERROR condition
;   caught 1 WARNING condition
;   caught 8 STYLE-WARNING conditions
Backtrace:
           7 (primitive-load "/gnu/store/6v5dy1rnk8m3h154q4c8mjwgq7y…")
In ice-9/eval.scm:
   191:35  6 (_ _)
In ice-9/boot-9.scm:
    152:2  5 (with-fluid* _ _ _)
    152:2  4 (with-fluid* _ _ _)
In srfi/srfi-1.scm:
    640:9  3 (for-each #<procedure 98e3a0 at /gnu/store/k4nbgbgygrv…> …)
In /gnu/store/k4nbgbgygrv0lk97d5phx8fwrxr0ah9r-module-import/guix/build/gnu-build-system.scm:
   799:31  2 (_ _)
In /gnu/store/k4nbgbgygrv0lk97d5phx8fwrxr0ah9r-module-import/guix/build/asdf-build-system.scm:
    124:4  1 (build #:outputs _ #:inputs _ #:asd-file _ # _)
In unknown file:
           0 (scm-error misc-error #f "~A ~S ~S" ("lisp-eval-pro…" …) …)

ERROR: In procedure scm-error:
lisp-eval-program failed! "/gnu/store/rdvy6q3nskb0r01rwjrxj3935d850r2d-sbcl-1.4.4/bin/sbcl" ((require :asdf) (let ((*package* (find-package :asdf))) (load "/gnu/store/39vh5ghdn9x7zwb6ky7law678wkz20l2-next-browser-0.0.8-1.ccc289b/share/common-lisp/sbcl-source/next/gtk/next/next.asd")) (asdf:operate (quote asdf:compile-bundle-op) "next/gtk"))
--8<---------------cut here---------------end--------------->8---

Andy, any clue on this?

--
Pierre Neidhardt
https://ambrevar.xyz/