[SciPy-dev] API mismatch woes

[Pierre GM]

All,
I like to use
python -c "import setuptools; execfile('setup.py')" develop
to install numpy in a virtual environment, which simplifies testing  
local modifications. Unfortunately, I keep running into the API  
mismatch problem, even after getting rid of the build directory and  
the *.pyc files. I'm sure I must be missing some simple step, but  
which one ?

FYI,
OS : Mac 10.6
python : Python 2.6.2 (r262:71600, Sep 11 2009, 18:38:58) (installed  
in its own /usr/local/Cellar)
gcc : i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1

Note that the following command works like a charm.
pip install -E whatever -e svn+http://svn.scipy.org/svn/numpy/trunk/#egg=numpy