# include <sys/select.h>
# endif
-# if defined(sun)
+# if defined(__sun)
# include <sys/filio.h>
# else
# ifndef VMS
# endif
-# if defined(sun) && !defined(__svr4__) && !defined(__SVR4)
+# if defined(__sun) && !defined(__svr4__) && !defined(__SVR4)
/* include headers first, so our defines don't break it */
# include <stdlib.h>
# include <string.h>