# File lib/rubygems/ext/rake_builder.rb, line 10defself.build(extension,dest_path,results,args = [],lib_dir =nil,extension_dir =Dir.pwd,target_rbconfig =Gem.target_rbconfig,n_jobs:nil)iftarget_rbconfig.pathwarn"--target-rbconfig is not yet supported for Rake extensions. Ignoring"endif/mkrf_conf/i.match?(File.basename(extension))run([Gem.ruby,File.basename(extension),*args],results,class_name,extension_dir)endrake =ENV["rake"]ifrakerake =shellsplit(rake)elsebeginrake =ruby<<"-rrubygems"<<Gem.bin_path("rake","rake")rescueGem::Exceptionrake = [Gem.default_exec_format%"rake"]endendrake_args = ["RUBYARCHDIR=#{dest_path}","RUBYLIBDIR=#{dest_path}",*args]run(rake+rake_args,results,class_name,extension_dir)resultsend