--- editline-1.17.1/examples/excallback.c	2020-02-23 19:37:53.000000000 +1100
+++ editline-1.17.1/examples/excallback.c.new	2020-06-09 00:29:06.482173883 +1000
@@ -39,6 +39,7 @@
 
 #include <stdio.h>
 #include <sys/types.h>
+#include <sys/select.h>
 
 #ifdef HAVE_STDLIB_H
 #include <stdlib.h>