diff -r 89cd8302abd3 -r 40e20ffddcb4 src/SConscript
--- a/src/SConscript	Sat Mar 19 21:13:04 2011 -0700
+++ b/src/SConscript	Fri Mar 25 12:27:57 2011 -0700
@@ -253,6 +253,9 @@
 for extra_dir in extras_dir_list:
     prefix_len = len(dirname(extra_dir)) + 1
     for root, dirs, files in os.walk(extra_dir, topdown=True):
+        if 'build' in dirs and extra_dir in env['BUILDROOT']: # if build lives in the extras directory dont walk down it
+            dirs.remove('build')
+
         if 'SConscript' in files:
             build_dir = joinpath(env['BUILDDIR'], root[prefix_len:])
             SConscript(joinpath(root, 'SConscript'), variant_dir=build_dir)