Homebrew formula for libjpeg-turbo, a high-speed version of libjpeg for x86 and x86-64 processors which uses SIMD instructions (MMX, SSE2, etc.) to accelerate baseline JPEG compression and decompression.

libjpeg-turbo.rb

require 'formula'

class LibjpegTurbo <Formula
  url 'http://downloads.sourceforge.net/sourceforge/libjpeg-turbo/libjpeg-turbo-1.0.1.tar.gz'
  homepage 'http://libjpeg-turbo.virtualgl.org/'
  md5 'e94b72694c9afd716458367dfe84ce1e'

  if Hardware.is_64_bit?
    depends_on 'nasm'
  end
  
  def install
    configure_flags = ["--disable-debug", "--disable-dependency-tracking", "--prefix=#{prefix}"]
    if Hardware.is_64_bit?
      configure_flags << "--host x86_64-apple-darwin NASM=#{HOMEBREW_PREFIX}/bin/nasm"
    end
    system "./configure", *configure_flags
    system "make install"
  end
end