Index: libc/include/libc.h
===================================================================
--- libc/include/libc.h	(revision cc6f688f354a22e73aa08bf66a55f9faa4fea32c)
+++ libc/include/libc.h	(revision cf4a82392e2e531adcc4ea3efef573197358c03b)
@@ -41,5 +41,5 @@
 extern void __main(void);
 extern void __exit(void);
-extern unsigned int __syscall(const syscall_t id, const sysarg_t p1, const sysarg_t p2, const sysarg_t p3);
+extern sysarg_t __syscall(const syscall_t id, const sysarg_t p1, const sysarg_t p2, const sysarg_t p3);
 
 
Index: libc/include/unistd.h
===================================================================
--- libc/include/unistd.h	(revision cf4a82392e2e531adcc4ea3efef573197358c03b)
+++ libc/include/unistd.h	(revision cf4a82392e2e531adcc4ea3efef573197358c03b)
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2005 Martin Decky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 __LIBC__UNISTD_H__
+#define __LIBC__UNISTD_H__
+
+#include <types.h>
+
+#define NULL 0
+
+extern ssize_t write(int fd, const void * buf, size_t count);
+
+#endif