diff --git a/pym/cl_builder.py b/pym/cl_builder.py
index 8a1d2a9..279a906 100644
--- a/pym/cl_builder.py
+++ b/pym/cl_builder.py
@@ -107,6 +107,11 @@ class cl_builder(color_print):
     def createDevNodes(self,directory):
         """Create nodes for dev http://dev.gentoo.org/~a3li/openrc.txt"""
         devPath = path.join(directory,"dev")
+        # clean dev
+        for pathname,dirs,files in os.walk(devPath,topdown=False):
+            map(lambda x:os.unlink(path.join(pathname,x)),files)
+            map(lambda x:os.unlink(x) if path.islink(x) else os.rmdir(x),
+                map(lambda x:path.join(pathname,x),dirs))
         for node,mode,dmode,major,minor in [("console",0600,stat.S_IFCHR,5,1),
                                       ("null",0666,stat.S_IFCHR,1,3),
                                       ("zero",0666,stat.S_IFCHR,1,5)]: