Compile failure due to libltdl

[Andreas Enge]

Hello,

"make" (even after "make distclean") currently fails for me with the following
error message:

  GUILEC gnu/packages/apr.go
Backtrace:
In ice-9/boot-9.scm:
2951: 19 [define-module* (gnu packages qt) #:filename ...]
2926: 18 [resolve-imports ((# # #) (#) (#) (#) ...)]
2864: 17 [resolve-interface (gnu packages pulseaudio) #:select ...]
2789: 16 [#<procedure ca17a0 at ice-9/boot-9.scm:2777:4 (name #:optional 
autoload version #:key ensure)> # ...]
3065: 15 [try-module-autoload (gnu packages pulseaudio) #f]
2401: 14 [save-module-excursion #<procedure 1ed3e10 at ice-9/boot-9.scm:3066:17 
()>]
3085: 13 [#<procedure 1ed3e10 at ice-9/boot-9.scm:3066:17 ()>]
In unknown file:
   ?: 12 [primitive-load-path "gnu/packages/pulseaudio" ...]
In ice-9/eval.scm:
 505: 11 [#<procedure bec640 at ice-9/eval.scm:499:4 (exp)> (define-module # # 
...)]
In ice-9/psyntax.scm:
1106: 10 [expand-top-sequence ((define-module # # # ...)) () ((top)) ...]
 989: 9 [scan ((define-module (gnu packages pulseaudio) #:use-module ...)) () 
...]
 279: 8 [scan ((#(syntax-object let # ...) (#) (# #) ...)) () ...]
In ice-9/eval.scm:
 411: 7 [eval # ()]
In ice-9/boot-9.scm:
2951: 6 [define-module* (gnu packages pulseaudio) #:filename ...]
2926: 5 [resolve-imports ((#) (#) (# # l:) (#) ...)]
2877: 4 [resolve-interface (gnu packages autotools) #:select ...]
 768: 3 [for-each #<procedure 1a83050 at ice-9/boot-9.scm:2877:20 (bspec)> #]
2883: 2 [#<procedure 1a83050 at ice-9/boot-9.scm:2877:20 (bspec)> libltdl]
In unknown file:
   ?: 1 [scm-error misc-error #f ...]
In ice-9/boot-9.scm:
 106: 0 [#<procedure f959c0 at ice-9/boot-9.scm:97:6 (thrown-k . args)> 
misc-error ...]

ice-9/boot-9.scm:106:20: In procedure #<procedure f959c0 at 
ice-9/boot-9.scm:97:6 (thrown-k . args)>:
ice-9/boot-9.scm:106:20: no binding `libltdl' in module (gnu packages autotools)
Makefile:4222: recipe for target 'gnu/packages/apr.go' failed
make[2]: *** [gnu/packages/apr.go] Error 1

This looks a lot like a circular dependency (qt and/or pulseaudio on one hand,
libltdl on the other hand). How does one go about debugging this now?

Andreas