Try copying sage onto your local hard drive (e.g into Applications)  
before starting it up.

On Dec 11, 2009, at 11:28 AM, Gennaro Alphonse wrote:

> I download Sage 4.2.1 for Mac OS 10.5 with Intel, and when I select
> the sage file to run with the terminal, it give me the next message:
>
> The Sage install tree may have moved.
> Regenerating Python.pyo and .pyc files that hardcode the install PATH
> (please wait at most a few minutes)...
> Do not interrupt this.
> Traceback (most recent call last):
>  File "/Volumes/sage-4.2.1-osx-10.5-32bit-i386-Darwin/sage/local/bin/
> sage-location", line 180, in <module>
>    update_library_files(R)
>  File "/Volumes/sage-4.2.1-osx-10.5-32bit-i386-Darwin/sage/local/bin/
> sage-location", line 128, in update_library_files
>    open(LIB + F,'w').write(H)
> IOError: [Errno 30] Read-only file system: '/Volumes/sage-4.2.1-
> osx-10.5-32bit-i386-Darwin/sage/local/lib/lib4ti2gmp.la'
>
> What can I do in this case ?
>
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