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With an old install, but using full install command

When rebuilding an old install, the main trap is to avoid having architectural defaults make it so you don't time your new kernel. Tail your Make.<arch> file, and see if the macro ARCHDEF is set. If so, cd to the directory pointed at by ARCHDEF, and then issue
   rm <pre>u* 
   rm <pre>MMRES
From your ATLAS directory, then issue:
   rm bin/<arch>/INSTALL_LOG/*
   rm tune/blas/gemm/<arch>/res/<pre>u*
   rm tune/blas/gemm/<arch>/res/<pre>MMRES
   make install arch=<arch>

R. Clint Whaley 2001-08-04