--- a/src/constants.h
+++ b/src/constants.h
@@ -103,7 +103,7 @@
 #define INCLUDES	8
 #define	FIELDS		9
 
-#if (BSD || V9) && !__NetBSD__ && !__FreeBSD__
+#if (BSD || V9) && !__NetBSD__ && !__FreeBSD__ && !__MACH__
 # define TERMINFO	0	/* no terminfo curses */
 #else
 # define TERMINFO	1