diff -r b49e366556ba Lib/venv/__init__.py
--- a/Lib/venv/__init__.py	Mon Jun 02 14:43:24 2014 +0200
+++ b/Lib/venv/__init__.py	Tue Jun 03 15:18:04 2014 +0200
@@ -144,7 +144,8 @@ class EnvBuilder:
             (sys.platform != 'darwin')):
             p = os.path.join(env_dir, 'lib')
             link_path = os.path.join(env_dir, 'lib64')
-            os.symlink(p, link_path)
+            if not os.path.exists(link_path):
+                os.symlink(p, link_path)
         context.bin_path = binpath = os.path.join(env_dir, binname)
         context.bin_name = binname
         context.env_exe = os.path.join(binpath, exename)