diff -pruN ebnetd-1.0.orig/ebnetd/defs.h.in ebnetd-1.0/ebnetd/defs.h.in
--- ebnetd-1.0.orig/ebnetd/defs.h.in 2003-06-15 20:39:27.000000000 +0900
+++ ebnetd-1.0/ebnetd/defs.h.in 2020-01-31 20:16:21.136296356 +0900
@@ -313,8 +313,8 @@ extern char work_path[];
extern char configuration_file_name[];
extern in_port_t listening_port;
extern in_port_t old_listening_port;
-fd_set listening_files;
-int max_listening_file;
+extern fd_set listening_files;
+extern int max_listening_file;
extern int accepted_in_file;
extern int accepted_out_file;
extern uid_t user_id;