worktree: disallow adding same path multiple times

diff --git a/mailinfo.h b/mailinfo.h
index 04a25351d6d39c4d0bb00943bb23ee99e8d41bcf..766c03dd1d29d00beb75b7553fc6717e24978384 100644 (file)
--- a/mailinfo.h
+++ b/mailinfo.h
@@ -1,6 +1,8 @@
 #ifndef MAILINFO_H
 #define MAILINFO_H
 
+#include "strbuf.h"
+
 #define MAX_BOUNDARIES 5
 
 struct mailinfo {