-/* Wrapper to implement ANSI C's atexit using SunOS's on_exit. */
-/* This function is in the public domain. --Mike Stump. */
+/**
+ * \file atexit.c
+ * Wrapper to implement ANSI C's atexit using SunOS's on_exit.
+ *
+ * This function is in the public domain. --Mike Stump.
+ */
+
+#include <config.h>
#ifndef NEED_on_exit
int atexit(void (*f)())