def self.build(extension, dest_path, results, args=[], lib_dir=nil, extension_dir=Dir.pwd)
if File.basename(extension) =~ /mkrf_conf/i
run([Gem.ruby, File.basename(extension), *args], results, class_name, extension_dir)
end
rake = ENV['rake']
if rake
rake = rake.shellsplit
else
begin
rake = [Gem.ruby, "-I#{File.expand_path("../..", __dir__)}", "-rrubygems", Gem.bin_path('rake', 'rake')]
rescue Gem::Exception
rake = [Gem.default_exec_format % 'rake']
end
end
rake_args = ["RUBYARCHDIR=#{dest_path}", "RUBYLIBDIR=#{dest_path}", *args]
run(rake + rake_args, results, class_name, extension_dir)
results
end