checkout: do not fail if target is an empty directory

diff --git a/builtin/add.c b/builtin/add.c
index 352b85e8db19e1b4fa05ca37804f0c625e582912..ae6d3e262bcbb3dc57c0ddf146791380259b31be 100644 (file)
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -5,6 +5,7 @@
  */
 #include "cache.h"
 #include "builtin.h"
+#include "lockfile.h"
 #include "dir.h"
 #include "pathspec.h"
 #include "exec_cmd.h"