--- ray/src/rt/persist.c	1997/09/18 16:13:28	2.19
+++ ray/src/rt/persist.c	1997/10/16 13:49:22	2.20
@@ -14,7 +14,9 @@ static char SCCSid[] = "$SunId$ LBL";
 #include "paths.h"
 #include <signal.h>
 #include <sys/types.h>
+#ifdef INCL_SEL_H
 #include <sys/select.h>
+#endif
 #include <sys/stat.h>
 					/* select call compatibility stuff */
 #ifndef FD_SETSIZE