Add support for building the Xorg state tracker with scons.

scons ... statetrackers=xorg

SConstruct

@@ -44,7 +44,7 @@ else:
 opts = Variables('config.py')
 common.AddOptions(opts)
 opts.Add(ListVariable('statetrackers', 'state trackers to build', default_statetrackers,
-                     ['mesa', 'python']))
+                     ['mesa', 'python', 'xorg']))
 opts.Add(ListVariable('drivers', 'pipe drivers to build', default_drivers,
                      ['softpipe', 'failover', 'i915simple', 'i965simple', 'cell', 'trace', 'r300', 'identity']))
 opts.Add(ListVariable('winsys', 'winsys drivers to build', default_winsys,

src/gallium/SConscript

@@ -31,6 +31,7 @@ for driver in env['drivers']:
 SConscript('state_trackers/python/SConscript')
 SConscript('state_trackers/glx/xlib/SConscript')
 SConscript('state_trackers/dri/SConscript')
+SConscript('state_trackers/xorg/SConscript')
 
 if platform == 'windows':
 	SConscript('state_trackers/wgl/SConscript')

src/gallium/state_trackers/xorg/SConscript

@@ -0,0 +1,26 @@
+#######################################################################
+# SConscript for xorg state_tracker
+
+Import('*')
+
+if 'xorg' in env['statetrackers']:
+
+    env = env.Clone()
+
+    env.Append(CPPPATH = [
+	'#/src/mesa',
+    ])
+
+    env.ParseConfig('pkg-config --cflags --libs xorg-server')
+
+    st_xorg = env.ConvenienceLibrary(
+	target = 'st_xorg',
+	source = [ 'xorg_composite.c',
+		'xorg_crtc.c',
+		'xorg_dri2.c',
+		'xorg_driver.c',
+		'xorg_exa.c',
+		'xorg_output.c',
+		]
+    )
+    Export('st_xorg')