worktree: disallow adding same path multiple times

diff --git a/environment.c b/environment.c
index 68523b6b0ecd3bf924b075bd47bf0cd3426795f3..3f3c8746c2b6e30c5d9e40772078a39c3a9638c8 100644 (file)
--- a/environment.c
+++ b/environment.c
@@ -8,6 +8,7 @@
  * are.
  */
 #include "cache.h"
+#include "branch.h"
 #include "repository.h"
 #include "config.h"
 #include "refs.h"