INSTALLATION INSTRUCTIONS:
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   The file sage-x.y.z-x86_64-Linux.tgz, which you download here,
   contains a pre-built version of SAGE that can be decompressed
   into a directory and run from there.  Just type

      tar zxvf sage-x.y.z-x86_64-Linux.tgz

   then change into the resulting directory and type "./sage" to 
   run SAGE.

   This binary will *only* work on AMD 64-bit computers (e.g., Opteron
   and Athlon 64).