--- make1.c.orig	2023-01-15 00:19:14
+++ make1.c	2023-01-15 00:19:19
@@ -62,6 +62,10 @@
 # include "command.h"
 # include "execcmd.h"
 
+# ifdef OS_MACOSX
+# include <unistd.h>
+# endif
+
 static void make1a( TARGET *t, TARGET *parent );
 static void make1b( TARGET *t );
 static void make1c( TARGET *t );