--- pouetChess.py	2006-05-28 14:48:12.000000000 +0000
+++ pouetChess.py.new	2008-06-30 03:46:46.000000000 +0000
@@ -2,6 +2,7 @@
 
 import re, os, sys
 import SCons.Util
+import commands
 from SCons.Options import Options
 
 
@@ -184,9 +185,14 @@
 
 
 	f.close()
+	arch = commands.getoutput('uname -m') 
 	if len(archflags) == 0:
-		print "Couldn't detect your CPU, guessing i686 compatible.."
-		archflags=['-march=i686']
+		if arch == 'x86_64':
+			print "Couldn't detect your CPU, `uname -m` indicates x86_64 compatible.."
+			archflags=['-march=x86-64']
+		else:
+			print "Couldn't detect your CPU, guessing i686 compatible.."
+			archflags=['-march=i686']
 	return archflags