atlas.rb

require 'formula'

class Atlas < Formula
  homepage 'http://math-atlas.sourceforge.net/'
  url 'http://sourceforge.net/projects/math-atlas/files/Stable/3.10.0/atlas3.10.0.tar.bz2'
  sha1 '085e8219d01626485079b785309d4d6502ab1ac0'

  # Even though atlas is built with --nof77 the check step will fail unless gcc47 is 
  # built with fortran.
  depends_on "homebrew/versions/gcc47" => "enable-fortran"

  def install
    ENV.j1 # Atlas does its own parallel build

    system "mkdir -p BUILD"
    cd "BUILD"
    # pull in netlib LAPACK because the default Apple LAPACK doesn't include
    system "curl", "-C", "-", "-o", "lapack-3.4.2.tgz", "http://www.netlib.org/lapack/lapack-3.4.2.tgz"

    # DO NOT use the brew-recommended form of system with arguments separated by commas that avoids
    # a subshell.
    # For whatever reason this configure only succeeds if run in a subshell.

    # The combination of flags below was generated by the MacPorts portfile for atlas...if this
    # breaks in the future, check there. Find it with: brew -S --macports atlas
    system "../configure " +
        "--nof77 " +
        "--with-netlib-lapack-tarfile=" + pwd() + "/lapack-3.4.2.tgz " +
        "--prefix=#{prefix} " +
        "--dylibs " +
        "-O 12 -v 5 -A 26 -V 448 -Si omp 0 " +
        "-C acg #{HOMEBREW_PREFIX}/bin/gcc-4.7 " +
        "-F acg '-fomit-frame-pointer -mfpmath=sse -O3 -fno-schedule-insns2 -fPIC -msse4.2' " +
        "-b 64 -D c -DPentiumCPS=2300"

    system "make build"
    system "make check"
    system "make install"
  end
end