build fix

snakehouse/satella.py

@@ -13,7 +13,7 @@ def _has_separator(path: str) -> bool:
     if len(path) == 3:
         if path.endswith(':/') or path.endswith(':\\'):
             return False
-    return any(map(lambda x: x in path, SEPARATORS))
+    return any(map(lambda x: x in path, os.path.sep))
 
 def _cond_join(prefix: tp.Optional[str], filename: str) -> str:
     """or a conditional os.path.join"""