class Gem::Ext::ExtConfBuilder

# File lib/rubygems/ext/ext_conf_builder.rb, line 13
def self.build(extension, directory, dest_path, results, args=[], lib_dir=nil)
 tmp_dest = Dir.mktmpdir(".gem.", ".")
 t = nil
 Tempfile.open %w"siteconf .rb", "." do |siteconf|
 t = siteconf
 siteconf.puts "require 'rbconfig'"
 siteconf.puts "dest_path = #{(tmp_dest || dest_path).dump}"
 %w[sitearchdir sitelibdir].each do |dir|
 siteconf.puts "RbConfig::MAKEFILE_CONFIG['#{dir}'] = dest_path"
 siteconf.puts "RbConfig::CONFIG['#{dir}'] = dest_path"
 end
 siteconf.flush
 siteconf_path = File.expand_path siteconf.path
 rubyopt = ENV["RUBYOPT"]
 destdir = ENV["DESTDIR"]
 begin
 ENV["RUBYOPT"] = ["-r#{siteconf_path}", rubyopt].compact.join(' ')
 cmd = [Gem.ruby, File.basename(extension), *args].join ' '
 begin
 run cmd, results
 ensure
 FileUtils.mv 'mkmf.log', dest_path if File.exist? 'mkmf.log'
 end
 ENV["DESTDIR"] = nil
 ENV["RUBYOPT"] = rubyopt
 siteconf.unlink
 make dest_path, results
 if tmp_dest
 # TODO remove in RubyGems 3
 if Gem.install_extension_in_lib and lib_dir then
 FileUtils.mkdir_p lib_dir
 entries = Dir.entries(tmp_dest) - %w[. ..]
 entries = entries.map { |entry| File.join tmp_dest, entry }
 FileUtils.cp_r entries, lib_dir
 end
 FileEntry.new(tmp_dest).traverse do |ent|
 destent = ent.class.new(dest_path, ent.rel)
 destent.exist? or File.rename(ent.path, destent.path)
 end
 end
 ensure
 ENV["RUBYOPT"] = rubyopt
 ENV["DESTDIR"] = destdir
 end
 end
 t.unlink if t and t.path
 results
ensure
 FileUtils.rm_rf tmp_dest if tmp_dest
end