Installing BLAS on a mac OS X Yosemite

Question

I'm trying to Install BLAS on my Mac, but every time I run make I get this error (shown below the link). I was trying to follow the instructions on this website:

gfortran -O3 -c isamax.f -o isamax.o
make: gfortran: No such file or directory
make: *** [isamax.o] Error 1

I have no idea what this means or how to fix it so any help would be appreciated. Also I'm trying to install CBLAS and LAPACK so any tips/instructions for that would be nice if you know of a good source...Everything I've found so far is pretty confusing. Also I tried to install ATLAS but it kept not working.

Answer 1

This error is caused because gfortran is apparently not installed, so you'll need to download an installer package for OS X Yosemite 10.10 and install it:

gfortran 5.1 or gfortran 4.9.2 (info)

Once installed run the make command in the BLAS directory.

Answer 2

How to install Blas/Lapack: don't.

These libraries are the textbook example of enormous performance differences between simple and optimized code. And by optimizations I don't mean compiler: I mean algorithm transformations.

So you definitely do not want to download the "reference blas/lapack" from netlib or another location. If your system doesn't already come with an optimized version (Mac OS X does), see if you can get Intel's MKL library (free for students on Linux?), and otherwise get BLIS or OpenBlas or Atlas which are all open source optimized implementations.