qt: create a dbus variant

var/spack/repos/builtin/packages/qt/package.py

@@ -47,6 +47,7 @@ class Qt(Package):
     variant('krellpatch', default=False, description="Build with openspeedshop based patch.")
     variant('mesa',       default=False, description="Depend on mesa.")
     variant('gtk',        default=False, description="Build with gtkplus.")
+    variant('dbus',       default=False, description="Build with D-Bus support.")
 
     patch('qt3krell.patch', when='@3.3.8b+krellpatch')
 
@@ -61,7 +62,7 @@ class Qt(Package):
     depends_on("gtkplus", when='+gtk')
     depends_on("libxml2")
     depends_on("zlib")
-    depends_on("dbus", when='@4:')
+    depends_on("dbus", when='@4:+dbus')
     depends_on("libtiff")
     depends_on("libpng@1.2.56", when='@3')
     depends_on("libpng", when='@4:')
@@ -145,7 +146,7 @@ def patch(self):
 
     @property
     def common_config_args(self):
-        return [
+        config_args = [
             '-prefix', self.prefix,
             '-v',
             '-opensource',
@@ -154,7 +155,6 @@ def common_config_args(self):
             '-shared',
             '-confirm-license',
             '-openssl-linked',
-            '-dbus-linked',
             '-optimized-qmake',
             '-no-openvg',
             '-no-pch',
@@ -162,6 +162,13 @@ def common_config_args(self):
             '-no-nis'
         ]
 
+        if '+dbus' in self.spec:
+            config_args.append('-dbus-linked')
+        else:
+            config_args.append('-no-dbus')
+
+        return config_args
+
     # Don't disable all the database drivers, but should
     # really get them into spack at some point.