Can anyone cast any light on this for me?

This is OOB sage python
____________________

00:41 chi:lib.macosx-10.3-i386-2.5 504\> sage --version
Sage Version 3.2.3, Release Date: 2009-01-05

00:41 chi:lib.macosx-10.3-i386-2.5 505\> sage -python
Python 2.5.2 (r252:60911, Jan  6 2009, 19:03:06)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import _cublas
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dlopen(./_cublas.so, 2): Symbol not found:
__cg_png_create_info_struct
  Referenced from: /System/Library/Frameworks/
ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/
Versions/A/ImageIO
  Expected in: /Applications/sage/local/lib//libPng.dylib

>>>

System python - looks good (and it works)
____________
00:42 chi:lib.macosx-10.3-i386-2.5 506\> /usr/bin/python
Python 2.5.1 (r251:54863, Jan 13 2009, 10:26:13)
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import _cublas
>>> ^D

(Now this extension was built using the sage -python and I have it
working fine on another box with sage python but a hand cranked
framework python based sage from 3.1.1 )



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