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+#ifndef io_h
+#define io_h
+/* io.h */
+/* avr.modules - AVR modules. {{{
+ *
+ * Copyright (C) 2005 Nicolas Schodet
+ *
+ * Robot APB Team/Efrei 2006.
+ * Web: http://assos.efrei.fr/robot/
+ * Email: robot AT efrei DOT fr
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * }}} */
+
+#ifndef HOST
+
+/* Avr part. */
+#include <avr/interrupt.h>
+#if !defined (__AVR_LIBC_VERSION__) || __AVR_LIBC_VERSION__ < 10400UL
+# include <avr/signal.h>
+ /* No INTERRUPT as it is dangerous. */
+# undef INTERRUPT
+ /* SIGNAL is now ISR. */
+# define ISR SIGNAL
+#endif
+
+#else /* HOST */
+
+/* Same as on AVR. */
+#define _BV(x) (1<<(x))
+/* No interrupt support on host. */
+#define sei()
+#define cli()
+
+#endif /* HOST */
+
+#endif /* io_h */