--- a/SConstruct	2012-08-20 10:26:51.484835418 +0200
+++ b/SConstruct	2012-08-20 10:27:49.855374497 +0200
@@ -765,11 +765,16 @@
     binaries = ['python', 'python2.5', 'python2.6', 'python2.7', 'python25', 'python26', 'python27']
     for binary in binaries:
         try:
-            # py-2.4 compatible replacement for shell backticks
-            output = subprocess.Popen([binary, '--version'], stdout=subprocess.PIPE).communicate()[0]
-            match = version.search(output)
-            if match and float(match.group(1)) >= 2.5:
-                return binary
+            for path in smokeEnv['ENV']['PATH'].split(':'):
+                if os.path.isfile( '%s/%s' % (path, binary) ):
+                    # py-2.4 compatible replacement for shell backticks
+                    out, err = subprocess.Popen([binary, '-V'], stdout=subprocess.PIPE, stderr=subprocess.PIPE).communicate()
+                    for stream in (out, err):
+                        match = version.search(stream)
+                        if match:
+                            versiontuple = tuple(map(int, match.group(1).split('.')))
+                            if versiontuple >= (2, 5):
+                                return binary
         except:
             pass