+/* I_TERMIO:
+ * This symbol, if defined, indicates that the program should include
+ * <termio.h> rather than <sgtty.h>. There are also differences in
+ * the ioctl() calls that depend on the value of this symbol.
+ */
+/* I_TERMIOS:
+ * This symbol, if defined, indicates that the program should include
+ * the POSIX termios.h rather than sgtty.h or termio.h.
+ * There are also differences in the ioctl() calls that depend on the
+ * value of this symbol.
+ */
+/* I_SGTTY:
+ * This symbol, if defined, indicates that the program should include
+ * <sgtty.h> rather than <termio.h>. There are also differences in
+ * the ioctl() calls that depend on the value of this symbol.
+ */
+#$i_termio I_TERMIO /**/
+#$i_termios I_TERMIOS /**/
+#$i_sgtty I_SGTTY /**/
+