More tips for using R with GotoBLAS

After building R with GotoBLAS (See http://jychoi-report-cgl.blogspot.com/2009/04/compile-r-with-gotoblas.html), a few things we can do for verification.

1. Download a R benchmark script (http://r.research.att.com/benchmarks/R-benchmark-25.R) and run it to check if every step works ok. (You can compare the performance with ones from normal R build too.)

2. If R is hang in calling eigen() function, try to rebuild GotoBLAS and R by using the same fortran compiler.

3. If nothing works, one can use ATLAS instead of GotoBLAS