- | Just p' <- maybePrefixMatch "$topdir" p = top_dir ++ p'
- | Just p' <- maybePrefixMatch "$httptopdir" p = toHttpPath top_dir ++ p'
+ | Just p' <- stripPrefix "$topdir" p = top_dir ++ p'
+ | Just p' <- stripPrefix "$httptopdir" p = toHttpPath top_dir ++ p'