diff --git a/appl/popper/popper.h b/appl/popper/popper.h
index fabac9b59..12f4390cd 100644
--- a/appl/popper/popper.h
+++ b/appl/popper/popper.h
@@ -14,6 +14,14 @@
  *  Header file for the POP programs
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#define DEBUG
+#define RETURN_PATH_HANDLING
+#endif
+
+#define KERBEROS
+
 #include <syslog.h>
 #include "version.h"