patch 7.4.1551
Problem: Cannot generate help tags in all doc directories.
Solution: Make ":helptags ALL" work.
diff --git a/src/vim.h b/src/vim.h
index a89b668..ea3c498 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2288,4 +2288,9 @@
int vim_main2(int argc, char **argv);
#endif
+/* Used for flags of do_in_path() */
+#define DIP_ALL 1 /* all matches, not just the first one */
+#define DIP_DIR 2 /* find directories instead of files. */
+#define DIP_ERR 4 /* give an error message when none found. */
+
#endif /* VIM__H */