gnu: dbus: Add dependency on libX11.

* gnu/packages/glib.scm: Use #:export instead of 'define-public'.
  (dbus): Add LIBX11 as an input.

gnu/packages/glib.scm

@@ -35,9 +35,18 @@
   #:use-module (gnu packages python)
   #:use-module (gnu packages xml)
   #:use-module (gnu packages bash)
-  #:use-module (gnu packages file))
+  #:use-module (gnu packages file)
+  #:use-module (gnu packages xorg)
 
-(define-public dbus
+  ;; Export variables up-front to allow circular dependency with the 'xorg'
+  ;; module.
+  #:export (dbus
+            glib
+            dbus-glib
+            intltool
+            itstool))
+
+(define dbus
   (package
     (name "dbus")
     (version "1.6.4")
@@ -64,7 +73,12 @@
      `(("expat" ,expat)
        ("pkg-config" ,pkg-config)
        ("patch/localstatedir"
-        ,(search-patch "dbus-localstatedir.patch"))))
+        ,(search-patch "dbus-localstatedir.patch"))
+
+       ;; Add a dependency on libx11 so that 'dbus-launch' has support for
+       ;; '--autolaunch'.
+       ("libx11" ,libx11)))
+
     (home-page "http://dbus.freedesktop.org/")
     (synopsis "Message bus for inter-process communication (IPC)")
     (description
@@ -85,7 +99,7 @@ or through unencrypted TCP/IP suitable for use behind a firewall with
 shared NFS home directories.")
     (license license:gpl2+)))                     ; or Academic Free License 2.1
 
-(define-public glib
+(define glib
   (package
    (name "glib")
    (version "2.37.1")
@@ -157,7 +171,7 @@ dynamic loading, and an object system.")
    (home-page "http://developer.gnome.org/glib/")
    (license license:lgpl2.0+)))                        ; some files are under lgpl2.1+
 
-(define-public intltool
+(define intltool
   (package
     (name "intltool")
     (version "0.50.2")
@@ -198,7 +212,7 @@ The intltool collection can be used to do these things:
     oaf files. This merge step will happen at build resp. installation time.")
     (license license:gpl2+)))
 
-(define-public itstool
+(define itstool
   (package
     (name "itstool")
     (version "1.2.0")
@@ -232,7 +246,7 @@ information in their documents, such as whether a particular element should be
 translated.")
     (license license:gpl3+)))
 
-(define-public dbus-glib
+(define dbus-glib
   (package
     (name "dbus-glib")
     (version "0.100.2")