undefined identifier 'size_t'

[Joshua Hodkinson via Digitalmars-d-learn]

I have run into an issue compiling with dmd (version 2.071.0), it 
seems that the 'size_t' alias isn't resolving properly. I was 
wondering if someone has run into this before and if this is a 
bug or something I'm doing wrong? My call to dmd is:

..dmd2\windows\bin\dmd.exe -run hello.d -de -w -unittest
Here is a sample program:

import std.stdio;

void main () {
        stdout.writeln("Hello World!");
}

And the ouput:

..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\time.d(111): Error: 
undefined identifier 'size_t'
..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\time.d(111): Error: 
undefined identifier 'size_t'
..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(60): Error: 
undefined identifier 'size_t'
..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(68): Error: 
undefined identifier 'size_t'
..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(142): Error: 
undefined identifier 'size_t'
..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(146): Error: 
undefined identifier 'size_t'
..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(152): Error: 
undefined identifier 'size_t'
..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(154): Error: 
undefined identifier 'size_t'
..dmd2\windows\bin\..\..\src\druntime\import\core\stdc\wchar_.d(154): Error: 
undefined identifier 'size_t'


Thanks