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--- a/lib/tcpwrap.h
+++ b/lib/tcpwrap.h
@@ -18,7 +18,7 @@
 #include <mailutils/types.h>
 
 extern int mu_tcp_wrapper_enable;
-const char *mu_tcp_wrapper_daemon;
+extern const char *mu_tcp_wrapper_daemon;
 extern int mu_tcpwrapper_access (int fd);
 extern void mu_tcpwrapper_cfg_init (void);
 extern int mu_tcp_wrapper_prefork (int fd,