define 'download-tool' do name "A download tool like 'wget' or 'curl'" define_checker do check_for_command('wget') || check_for_command('curl') end on :debian do apt_get_install "wget curl" end on :redhat do yum_install "wget curl" end on :other_platforms do install_instructions "Please install either wget (http://www.gnu.org/software/wget/) or curl (http://curl.haxx.se/)." end end