diff -r da7c1a80df0d -r d2d6724aef32 holdingarea/llvm/llvm-gcc4.2-2.7-x86-mingw32/include/unistd.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/holdingarea/llvm/llvm-gcc4.2-2.7-x86-mingw32/include/unistd.h	Thu Sep 16 09:43:14 2010 +0100
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the Mingw32 package.
+ *
+ * unistd.h maps (roughly) to io.h
+ */
+
+#ifndef _UNISTD_H
+#define _UNISTD_H
+
+#include <io.h>
+#include <process.h>
+
+#define __UNISTD_GETOPT__
+#include <getopt.h>
+#undef __UNISTD_GETOPT__
+
+/* These are also defined in stdio.h. */
+#ifndef	SEEK_SET
+#define SEEK_SET 0
+#endif
+
+#ifndef	SEEK_CUR
+#define SEEK_CUR 1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END 2
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* This is defined as a real library function to allow autoconf
+   to verify its existence. */
+int ftruncate(int, off_t);
+__CRT_INLINE int ftruncate(int __fd, off_t __length)
+{
+  return _chsize (__fd, __length);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _UNISTD_H */