gnu: Add guile-8sync.

* gnu/packages/guile.scm (guile-8sync): New variable.

gnu/packages/guile.scm

@@ -1,7 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
-;;; Copyright © 2015 Christopher Allan Webber <cwebber@dustycloud.org>
+;;; Copyright © 2015, 2017 Christopher Allan Webber <cwebber@dustycloud.org>
 ;;; Copyright © 2016 Alex Sassmannshausen <alex@pompo.co>
 ;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
 ;;; Copyright © 2016 Erik Edrosa <erik.edrosa@gmail.com>
@@ -9,6 +9,7 @@
 ;;; Copyright © 2016 Alex Kost <alezost@gmail.com>
 ;;; Copyright © 2016 Adonay "adfeno" Felipe Nogueira <https://libreplanet.org/wiki/User:Adfeno> <adfeno@openmailbox.org>
 ;;; Copyright © 2016 Amirouche <amirouche@hypermove.net>
+;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -1536,4 +1537,36 @@ enable -f ~/.guix-profile/lib/bash/libguile-bash.so scm
 and then run @command{scm example.scm}.")
       (license gpl3+))))
 
+(define-public guile-8sync
+  (package
+    (name "guile-8sync")
+    (version "0.4.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://gnu/8sync/8sync-" version
+                                  ".tar.gz"))
+              (sha256
+               (base32
+                "1fvf8d2s3vvg4nyskbqaiqmlm2x571hv7hizcnmny45zvalydr9h"))))
+    (build-system gnu-build-system)
+    (native-inputs `(("autoconf" ,autoconf)
+                     ("automake" ,automake)
+                     ("guile" ,guile-next)
+                     ("pkg-config" ,pkg-config)
+                     ("texinfo" ,texinfo)))
+    (arguments
+     `(#:phases (modify-phases %standard-phases
+                  (add-before 'configure 'setenv
+                    (lambda _
+                      ;; quiet warnings
+                      (setenv "GUILE_AUTO_COMPILE" "0"))))))
+    (home-page "https://gnu.org/s/8sync/")
+    (synopsis "Asynchronous actor model library for Guile")
+    (description
+     "GNU 8sync (pronounced \"eight-sync\") is an asynchronous programming
+library for GNU Guile based on the actor model.
+
+Note that 8sync is only available for Guile 2.2 (guile-next in Guix).")
+    (license lgpl3+)))
+
 ;;; guile.scm ends here