[Pyobjc-dev] objc 2.2 and libxml2?

[Glenn <grp...@so...>]

Hi,

I've done a framework install of Python 2.6 on OSX10.5 and it works  
just fine.

To enable Cocoa/Python apps, I've installed pyobjc 2.2 and that works  
well enough that the native MacOSX backend in matplotlib runs properly.

However, when I try running my own app with Xcode, I get the following  
traceback:

[Session started at 2009-12-08 10:24:30 -0800.]
Traceback (most recent call last):
   File "main.py", line 10, in <module>
     import objc
   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/ 
python2.6/site-packages/pyobjc_core-2.2-py2.6-macosx-10.3-fat.egg/objc/ 
__init__.py", line 22, in <module>
     _update()
   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/ 
python2.6/site-packages/pyobjc_core-2.2-py2.6-macosx-10.3-fat.egg/objc/ 
__init__.py", line 19, in _update
     import _objc
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.6/ 
lib/python2.6/site-packages/pyobjc_core-2.2-py2.6-macosx-10.3-fat.egg/ 
objc/_objc.so, 2): Library not loaded: /usr/lib/libxml2.2.dylib
   Referenced from: /Library/Frameworks/Python.framework/Versions/2.6/ 
lib/python2.6/site-packages/pyobjc_core-2.2-py2.6-macosx-10.3-fat.egg/ 
objc/_objc.so
   Reason: Incompatible library version: _objc.so requires version  
10.0.0 or later, but libxml2.2.dylib provides version 9.0.0
2009-12-08 10:24:30.364 py1[960:10b] *** Terminating app due to  
uncaught exception 'NSInternalInconsistencyException', reason: '/Users/ 
glenn/learningcocoa/py1/main.m:44 main() PyRun_SimpleFile failed with  
file '/Users/glenn/learningcocoa/py1/build/Debug/py1.app/Contents/ 
Resources/main.py'.  See console for errors.'

So, to fix this, I installed the latest version of libxml2.2.dylib in / 
usr/local/lib. Unfortunately, subsequent installation of the latest  
distribution of Pyobjc doesn't fix the problem:

easy_install pyobjc==2.2  =>  /Library/Frameworks/Python.framework/ 
Versions/2.6/lib/python2.6/site-packages/pyobjc_core-2.2-py2.6- 
macosx-10.3-fat.egg

because that contains a precompiled _objc.so that is linked to /usr/ 
lib/libxml2.2.dylib.

What is the canonical way to get a framework install of pyobjc 2.2  
working properly in Python 2.6 on OS-X 10.5? I've read horror stories  
about breaking system apps if /usr/lib/libxml2.2.dylib is messed with.

Glenn