virtualenv installation fails on mac OSX 10.8.5. virtualenv 1.8.4; python 2.7.2
```
$ bin/pip install pandas
Downloading/unpacking pandas
  Downloading pandas-0.12.0.tar.gz (3.2MB): 3.2MB downloaded
  Running setup.py egg_info for package pandas
    Running from numpy source directory.
    Traceback (most recent call last):
      File "<string>", line 16, in <module>
      File "/Users/timanovsky/pandas/build/pandas/setup.py", line 548, in <module>
        **setuptools_kwargs)
      File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 112, in setup
        _setup_distribution = dist = klass(attrs)
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/dist.py", line 260, in __init__
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/dist.py", line 284, in fetch_build_eggs
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 563, in resolve
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 799, in best_match
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 811, in obtain
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/dist.py", line 327, in fetch_build_egg
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 446, in easy_install
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 476, in install_item
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 655, in install_eggs
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 930, in build_and_install
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 919, in run_setup
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 62, in run_setup
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 105, in run
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 64, in <lambda>
      File "setup.py", line 214, in <module>
        FULLVERSION += "-%s" % rev
      File "setup.py", line 191, in setup_package
        MICRO = 0
      File "/var/folders/3z/0r_ycyx15l58th50t5trb1mc0000gn/T/easy_install-D6SLmc/numpy-1.7.1/numpy/distutils/core.py", line 25, in <module>
      File "/var/folders/3z/0r_ycyx15l58th50t5trb1mc0000gn/T/easy_install-D6SLmc/numpy-1.7.1/numpy/distutils/command/build_ext.py", line 16, in <module>
      File "/var/folders/3z/0r_ycyx15l58th50t5trb1mc0000gn/T/easy_install-D6SLmc/numpy-1.7.1/numpy/distutils/system_info.py", line 220, in <module>
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 203, in _open
      File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 199, in _violation
    setuptools.sandbox.SandboxViolation: SandboxViolation: open('/dev/null', 'w') {}

    The package setup script has attempted to modify files on your system
    that are not within the EasyInstall build area, and has been aborted.

    This package cannot be safely installed by EasyInstall, and may not
    support alternate installation locations even if you run its setup
    script by hand.  Please inform the package's author and the EasyInstall
    maintainers to find out if a fix or workaround is available.
    Complete output from command python setup.py egg_info:
    Running from numpy source directory.

Traceback (most recent call last):

  File "<string>", line 16, in <module>

  File "/Users/timanovsky/pandas/build/pandas/setup.py", line 548, in <module>

    **setuptools_kwargs)

  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 112, in setup

    _setup_distribution = dist = klass(attrs)

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/dist.py", line 260, in __init__

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/dist.py", line 284, in fetch_build_eggs

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 563, in resolve

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 799, in best_match

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/pkg_resources.py", line 811, in obtain

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/dist.py", line 327, in fetch_build_egg

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 446, in easy_install

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 476, in install_item

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 655, in install_eggs

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 930, in build_and_install

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/command/easy_install.py", line 919, in run_setup

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 62, in run_setup

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 105, in run

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 64, in <lambda>

  File "setup.py", line 214, in <module>

    FULLVERSION += "-%s" % rev

  File "setup.py", line 191, in setup_package

    MICRO = 0

  File "/var/folders/3z/0r_ycyx15l58th50t5trb1mc0000gn/T/easy_install-D6SLmc/numpy-1.7.1/numpy/distutils/core.py", line 25, in <module>

  File "/var/folders/3z/0r_ycyx15l58th50t5trb1mc0000gn/T/easy_install-D6SLmc/numpy-1.7.1/numpy/distutils/command/build_ext.py", line 16, in <module>

  File "/var/folders/3z/0r_ycyx15l58th50t5trb1mc0000gn/T/easy_install-D6SLmc/numpy-1.7.1/numpy/distutils/system_info.py", line 220, in <module>

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 203, in _open

  File "/Users/timanovsky/pandas/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg/setuptools/sandbox.py", line 199, in _violation

setuptools.sandbox.SandboxViolation: SandboxViolation: open('/dev/null', 'w') {}



The package setup script has attempted to modify files on your system

that are not within the EasyInstall build area, and has been aborted.



This package cannot be safely installed by EasyInstall, and may not

support alternate installation locations even if you run its setup

script by hand.  Please inform the package's author and the EasyInstall

maintainers to find out if a fix or workaround is available.

----------------------------------------
Command python setup.py egg_info failed with error code 1 in /Users/timanovsky/pandas/build/pandas
Storing complete log in /Users/timanovsky/.pip/pip.log
```
