title: Installing BLAS on a mac OS X Yosemite
body: <p>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 <a href="https://pheiter.wordpress.com/2012/09/04/howto-installing-lapack-and-blas-on-mac-os/" rel="nofollow noreferrer">this website</a>: </p>
  
  <pre><code>gfortran -O3 -c isamax.f -o isamax.o
  make: gfortran: No such file or directory
  make: *** [isamax.o] Error 1
  </code></pre>
  
  <p>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. </p>