
   -A #           : Set config mach to #
   -C 'string'    : Add string to CDEFS
   -D #           : Set various levels of what config will do (additive):
      0           : Create Make.ARCH and config logfiles only
      1           : Unpack & set arch defauls
      2           : Create ARCH subdirectories
      4           : Create the ATLrun shell script
      8           : If needed, create winf77.exe
     16           : Store the known L1 value
     32           : Move the config logfiles to ARCH subdir
   -N #           : Set ncpu to #
   -t <TOPdir>    : Set TOPdir as indicated
   -a <arch>      : Set ARCH to <arch>
   -b <1/blaslib> : Use this BLAS for BLASlib (1: search for blas)
   -f <f77>       : Use <f77> for F77
   -c <CC>        : Use <CC> for CC
   -m <MM>        : Use <MM> for MCC
   -g <gcc>       : Use <gcc> for gcc
   -x <XCC>       : Use <XCC> for XCC
   -F [c,f,m,x] '<flags>': set the indicated compiler flags
NOTE: If a compiler is specified without flags, ATLAS will try to fill in
      appropriate flags.  This is the recommended way to get config to select
      a non-default supported compiler.
