guix can't find (gnutls)

[Federico Beffa]

Hi,

for some reason Guix can't find (gnutls) despite the module being
installed and usable in Guile:

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$ echo $GUILE_LOAD_PATH
/home/beffa/.guix-profile/share/guile/site/2.0:/usr/local/share/guile/site/2.0:/usr/share/guile/site:/usr/share/guile/site/2.0
$ echo $GUILE_LOAD_COMPILED_PATH
/home/beffa/.guix-profile/lib/guile/2.0/site-ccache:/home/beffa/.guix-profile/share/guile/site/2.0
$ ls /home/beffa/.guix-profile/share/guile/site/2.0
cairo  cairo.scm  gnutls  gnutls.scm  json  json.go  json.scm
minikanren  minikanren.go  minikanren.scm  ssh
$ guix environment --ad-hoc ghc
substitute: warning: failed to install locale: Invalid argument
The following derivations will be built:
   /gnu/store/rgzwdcw04i0x56ywmg3glicvrn8xk7sd-profile.drv
   /gnu/store/rrakjd0ym7q2qcx1kr3xsp7y9kxf4sdv-fonts-dir.drv
   /gnu/store/r48q6lmxwlsxjq30h2mrv1sp30ahx0fw-ghc-package-cache.drv
   /gnu/store/p2ijlnhbbc0sj8v5qcd2vj5fxgm3qaim-ca-certificate-bundle.drv
   /gnu/store/50l8wnbkmw98svirfsjcamxfsdsiyjly-info-dir.drv
The following file will be downloaded:
   /gnu/store/h2zf6y4f52wmh4qa8lckssxzffnxjvrv-ghc-8.0.2
warning: failed to install locale: Invalid argument
Downloading 
https://mirror.hydra.gnu.org/nar/h2zf6y4f52wmh4qa8lckssxzffnxjvrv-ghc-8.0.2
(1011.3MiB installed)...
;;; Failed to autoload make-session in (gnutls):
;;; ERROR: missing interface for module (gnutls)
Backtrace:
In ice-9/boot-9.scm:
 160: 9 [catch #t #<catch-closure 22e3da0> ...]
In unknown file:
   ?: 8 [apply-smob/1 #<catch-closure 22e3da0>]
In ice-9/boot-9.scm:
  66: 7 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 6 [eval # #]
In ice-9/boot-9.scm:
2404: 5 [save-module-excursion #<procedure 2303900 at
ice-9/boot-9.scm:4051:3 ()>]
4056: 4 [#<procedure 2303900 at ice-9/boot-9.scm:4051:3 ()>]
1727: 3 [%start-stack load-stack ...]
1732: 2 [#<procedure 2316c00 ()>]
In unknown file:
   ?: 1 [primitive-load "/usr/local/bin/guix"]
In guix/ui.scm:
1228: 0 [run-guix-command substitute "--substitute" ...]

guix/ui.scm:1228:8: In procedure run-guix-command:
guix/ui.scm:1228:8: In procedure module-lookup: Unbound variable: make-session
guix environment: error: build failed: some substitutes for the
outputs of derivation
`/gnu/store/y8ih837wbsxlhsscj8yg37pa6ycarrp8-ghc-8.0.2.drv' failed
(usually happens due to networking issues); try `--fallback' to build
derivation from source
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I can load the module in Guile without problems:
------------------------------------------------------------------------------
$ guile
GNU Guile 2.0.13
Copyright (C) 1995-2016 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(guile-user)> ,use (gnutls)
scheme@(guile-user)> make-session
$1 = #<procedure make-session (_)>
scheme@(guile-user)>

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Any suggestion?

Thanks,
Fede