[SciPy-User] trouble installing scipy on Mac10.6.4 with Python2.7

Ralf Gommers ralf.gommers@googlemail....
Sun Sep 26 18:45:34 CDT 2010

On Thu, Sep 16, 2010 at 8:52 AM, Eric Schow <eschow@uci.edu> wrote:

> Hi all,
> I am new to Python and NumPy/SciPy, and I'm having trouble getting scipy
> installed on my machine.
> I am working on an Intel Mac running OS 10.6.4, and I've recently updated
> the python installation to 2.7. I have installed NumPy 1.5.0, and I am
> trying to install scipy 0.8.0, which I downloaded as a tarball from
> sourceforge.

0.8.0 was not fully working with 2.7, some fixes went into trunk after the
release. please use a recent svn checkout.

I have gcc 4.2.1 installed (through Xcode), although the build process seems
> to be calling gcc4.0. I have gfortran, which I just re-installed from
> http://r.research.att.com/tools/, as suggested in the installation notes
> that came with scipy. The problem seems to be with gfortran, although I
> admit I'm a little out of my league as I try to troubleshoot this one. The
> log file is attached. Finally, I initiated the build with this command:
> LDFLAGS="-arch x86_64" FFLAGS="-arch x86_64" python setup.py build

This doesn't extend but overrides the build flags, that's how distutils
works. With numscons this should work as advertised (although it looks like
numscons has some issue with 2.7 ATM). I've just added a warning that
describes this better at http://www.scipy.org/Installing_SciPy/Mac_OS_X,
because people keep running into this issue.

> Any help on this issue will be appreciated. BTW, I would prefer to go with
> Python 2.7 (as opposed to 2.6, for which there is a .dmg available) because
> of its purported increased compatibility with Python 3.x.

I'd go with 2.6 for now, that's properly tested and binaries are available.
Any 2.7 issues should be worked out soon, but at the moment YMMV.

Sorry for the very slow reply.


> Thanks a mole,
> Eric
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