# File ext/RMagick/extconf.rb, line 53
def check_multiple_imagemagick_versions()
   versions = []
   path = ENV['PATH'].split(File::PATH_SEPARATOR)
   path.each do |dir|
      file = File.join(dir, "Magick-config")
      if File.executable? file
         vers = `#{file} --version`.chomp.strip
         prefix = `#{file} --prefix`.chomp.strip
         versions << [vers, prefix, dir]
      end
   end
   versions.uniq!
   if versions.size > 1
      msg = "\nWarning: Found more than one ImageMagick installation. This could cause problems at runtime.\n"
      versions.each do |vers, prefix, dir|
         msg << "         #{dir}/Magick-config reports version #{vers} is installed in #{prefix}\n"
      end
      msg << "Using #{versions[0][0]} from #{versions[0][1]}.\n\n"
      Logging::message msg
      message msg
   end
end