I can see the above file is called from sage-env, but I'm trying to work 
out exactly that the aim of it is. Do we really need the script at all?

It seems to do 3 things.

1) If SAGE64 is yes, it prints we are building 64-bit on Solaris or OS X.

2) Creates a file called SAGE_LOCAL/lib/sage-64.txt if SAGE64 was set to 
yes. Is that file used by anything else?


3) Checks if the file "$SAGE_LOCAL"/lib/sage-64.txt  exists, and if so 
sets SAGE64 to "yes".

I really can't see the point in creating this file 
SAGE_LOCAL"/lib/sage-64.txt The documented way to make a 64-bit build is 
to set SAGE64 to "yes", so its unlikely someone will want to force it to 
that by creating the file.


Perhaps I'm overlooking the importance of this file.

If it does no more than I think it does, then it might as well be 
ignored and the 'echo' statements put in sage-env.




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