libpython.dylib sym link ?

Christopher Jones jonesc at
Tue Sep 13 10:54:20 PDT 2011


Looking into things a bit more, I think I find what the root build system is doing wrong. Its not quite as simple as I first thought. I had a small typo in the paths I was passing by hand to test things outside macports, and when I fixed that I now get

Checking for Python.h ... /opt/local/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6
Checking for python2.7, libpython2.7, libpython, python, or Python ... no

so it is looking for a versioned library, but the wrong one.

In the configure script there are hacks like

       pythonvers=`python -c 'import sys; sys.stdout.write(sys.version[:3])'`

… so basically it picks up whatever the user has as there default 'python' version and uses that as the version. This explains why I get the output above, and why on Lion python 2.7 seems OK but 2.6 fails, whilst when I was still on SL, 2.6 was OK and 2.7 failed.

I'll raise the issue with the root devs, to see if it would be possible to fix this…


On Sep 13, 2011, at 4:30 PM, Brandon Allbery wrote:

> On Tue, Sep 13, 2011 at 07:22, Chris Jones <jonesc at> wrote:
> I guess the root port always uses -lpython without querying the python
> config. A symlink in this directory should not harm, so it could be added.
> I think this is the case. The root build system doesn't allow for a versioned python library, only 'libpython'.
> I'll try and follow this up with the root devs upstream, but I suspect it will take some effort to get this changed, if at all. If it would be easy and OK for the python ports to just add this symlink in the Frameworks areas, that would be very useful indeed.
> You might want to point out that the Python developers (not the MacPorts Python folks, but GvR & co.) are unlikely to have any sympathy for anyone who doesn't use the correct python*-config command to get the correct library, especially given that it's still currently necessary in many environments to have both a Python 2.x and Python 3.x installed.
> -- 
> brandon s allbery                                      allbery.b at
> wandering unix systems administrator (available)     (412) 475-9364 vm/sms

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