diff -ur a/test/use_result.c b/test/use_result.c
--- a/test/use_result.c	1969-12-31 19:00:01.000000000 -0500
+++ b/test/use_result.c	2023-09-05 00:08:12.979889343 -0400
@@ -23,6 +23,8 @@
   51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
 */
 
+#include <unistd.h>
+
 #include "tap.h"
 
 SQLINTEGER my_max_rows= 100;