I've just downloaded 
ftp://ftp.fu-berlin.de/unix/misc/sage/linux/32bit/sage-4.0.2-linux-Debian_GNU_Linux_5.0_lenny-i686-Linux.tar.gz
and typed as described in 
ftp://ftp.fu-berlin.de/unix/misc/sage/linux/32bit/README.txt:

 >./sage
----------------------------------------------------------------------
| Sage Version 4.0.2, Release Date: 2009-06-18                       |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------

**********************************************************************
WARNING!  This Sage install was built on a machine that supports
instructions that are not available on this computer.  Sage will
likely fail with ILLEGAL INSTRUCTION errors! The following processor
flags were on the build machine but are not on this computer:

pni ssse3

Email http://groups.google.com/group/sage-support for help.
To remove this warning and make Sage start, just delete
 
/home/hemmecke/scratch/sage-4.0.2-linux-Debian_GNU_Linux_5.0_lenny-i686-Linux/local/lib/sage-flags.txt
**********************************************************************

Does that simply mean that I have to get the complete sources and 
rebuild sage from sources? Probably not, because then someone would have 
written it in that message.

Does removing sage-flags.txt actually mean that later sage will run 
without ILLEGAL INSTRUCTION errors on my computer?

Ralf

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