diff --git a/install.py b/install.py
index 60421c2..ff1a48a 100755
--- a/install.py
+++ b/install.py
@@ -356,6 +356,8 @@ def create_if(name, cfg):
 
 def walk(action):
     for rootpath in TO_SYSTEM:
+        if not exists(rootpath):
+            continue
         os.chdir(rootpath)
         for dirpath, _, files in os.walk('.'):
             syspath = dirpath[1:]  # remove leading '.'