Include <sys/select.h> if HAVE_SYS_SELECT_H.

src/libraries/libisc-new/src/isc_event.c

@@ -26,6 +26,9 @@
 #ifdef HAVE_STDDEF_H
 #  include <stddef.h>
 #endif
+#ifdef HAVE_SYS_SELECT_H
+#  include <sys/select.h>
+#endif
 
 #include "isc.h"
 #include "intern.h"