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diff --git a/nuttx/include/stdbool.h b/nuttx/include/stdbool.h
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+/****************************************************************************
+ * include/stdbool.h
+ *
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_STDBOOL_H
+#define __INCLUDE_STDBOOL_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifdef CONFIG_ARCH_STDBOOL_H
+#  include <arch/stdbool.h>
+#else
+#  include <nuttx/compiler.h>
+#  include <stdint.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* bool, true, and false must be provided as macros so that they can be
+ * redefined by the application if necessary.
+ *
+ * NOTE: Under C99 'bool' is required to be defined to be the intrinsic type
+ * _Bool.  However, in this NuttX context, we need backward compatibility
+ * to pre-C99 standards where _Bool is not an intrinsic type.  Hence, we
+ * use _Bool8 as the underlying type.
+ */
+
+#define bool  _Bool8
+#define true  1
+#define false 0
+
+#define __bool_true_false_are_defined 1
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/* A byte is the smallest address memory element (at least in architectures
+ * that do not support bit banding).  The requirement is only that type _Bool
+ * be large enough to hold the values 0 and 1.  We select uint8_t to minimize
+ * the RAM footprint of the executable.
+ *
+ * NOTE: We can't actually define the type _Bool here.  Under C99 _Bool is
+ * an intrinsic type and cannot be the target of a typedef.  However, in this
+ * NuttX context, we also need backward compatibility to pre-C99 standards
+ * where _Bool is not an intrinsic type.  We work around this by using _Bool8
+ * as the underlying type.
+ */
+
+typedef uint8_t _Bool8;
+
+#endif /* CONFIG_ARCH_STDBOOL_H */
+#endif /* __INCLUDE_STDBOOL_H */