gnu: xbindkeys: Pass --build to configure.

* gnu/packages/xdisorg.scm (xbindkeys)[arguments]: Pass --build to
  configure.

gnu/packages/xdisorg.scm

@@ -1,6 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2013, 2014 Andreas Enge <andreas@enge.fr>
-;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2014, 2015 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
 ;;; Copyright © 2014, 2015 Alex Kost <alezost@gmail.com>
 ;;; Copyright © 2013, 2015 Ludovic Courtès <ludo@gnu.org>
@@ -26,6 +26,7 @@
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix packages)
   #:use-module (guix download)
+  #:use-module (guix utils)
   #:use-module (guix build-system gnu)
   #:use-module (gnu packages)
   #:use-module (gnu packages compression)
@@ -442,6 +443,13 @@ transparent text on your screen.")
     (inputs
      `(("libx11" ,libx11)
        ("guile" ,guile-2.0)))
+    (arguments `(#:configure-flags
+                 '(;; FIXME: xbindkeys-1.8.6's config.guess fails on mips64el.
+                   ,@(if (%current-target-system)
+                         '()
+                         (let ((triplet
+                                (nix-system->gnu-triplet (%current-system))))
+                           (list (string-append "--build=" triplet)))))))
     (home-page "http://www.nongnu.org/xbindkeys/")
     (synopsis "Associate a combination of keys with a shell command")
     (description