Index: usr.bin/xinstall/xinstall.c
===================================================================
--- usr.bin/xinstall/xinstall.c
+++ usr.bin/xinstall/xinstall.c
@@ -1150,7 +1150,8 @@
 		p++;
 	else
 		p = temp;
-	(void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
+	/* For compatibility with glibc we must use 6 'X' characters */
+	(void)strncpy(p, "INS@XXXXXX", &temp[tsize - 1] - p);
 	temp[tsize - 1] = '\0';
 	return (mkstemp(temp));
 }