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diff --git a/include/ac/syslog.h b/include/ac/syslog.h
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+/* Generic syslog.h */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#ifndef _AC_SYSLOG_H_
+#define _AC_SYSLOG_H_
+
+#if defined( HAVE_SYSLOG_H )
+#include <syslog.h>
+#elif defined ( HAVE_SYS_SYSLOG_H )
+#include <sys/syslog.h>
+#endif
+
+#if defined( LOG_NDELAY ) && defined( LOG_NOWAIT )
+# define OPENLOG_OPTIONS ( LOG_PID | LOG_NDELAY | LOG_NOWAIT )
+#elif defined( LOG_NDELAY )
+# define OPENLOG_OPTIONS ( LOG_PID | LOG_NDELAY )
+#elif defined( LOG_NOWAIT )
+# define OPENLOG_OPTIONS ( LOG_PID | LOG_NOWAIT )
+#elif defined( LOG_PID )
+# define OPENLOG_OPTIONS ( LOG_PID )
+#else
+# define OPENLOG_OPTIONS ( 0 )
+#endif
+
+#endif /* _AC_SYSLOG_H_ */