pypy-virtualenv issue

# PyPy version: 1.6
# OSX Snow Leopard 
# Virtualenv: 1.6.4

# Problem: os.py is actually located under pypy-env/lib-python/modified-2.7

Running virtualenv with interpreter /path/to/pypy/pypy-1.6/bin/pypy
Traceback (most recent call last):
  File "app_main.py", line 53, in run_toplevel
  File "/Library/Python/2.6/site-packages/virtualenv.py", line 1952, in <module>
    main()
  File "/Library/Python/2.6/site-packages/virtualenv.py", line 810, in main
    never_download=options.never_download)
  File "/Library/Python/2.6/site-packages/virtualenv.py", line 901, in create_environment
    site_packages=site_packages, clear=clear))
  File "/Library/Python/2.6/site-packages/virtualenv.py", line 1036, in install_python
    copy_required_modules(home_dir)
  File "/Library/Python/2.6/site-packages/virtualenv.py", line 989, in copy_required_modules
    copyfile(filename, dst_filename)
  File "/Library/Python/2.6/site-packages/virtualenv.py", line 415, in copyfile
    copyfileordir(src, dest)
  File "/Library/Python/2.6/site-packages/virtualenv.py", line 392, in copyfileordir
    shutil.copy2(src, dest)
  File "/path/to/pypy/pypy-1.6/lib-python/2.7/shutil.py", line 127, in copy2
    copyfile(src, dst)
  File "/path/to/pypy/pypy-1.6/lib-python/2.7/shutil.py", line 82, in copyfile
    with open(dst, 'wb') as fdst:
IOError: [Errno 2] No such file or directory: 'pypy-env/lib-python/2.7/os.py'