extconf.rb in io-console-0.4.1 vs extconf.rb in io-console-0.4.2

@@ -10,11 +10,17 @@
 when have_header(hdr = "sgtty.h")
   %w"stty gtty".each {|f| have_func(f, hdr)}
 else
   ok = false
 end
-have_header("sys/ioctl.h")
-have_func("rb_io_get_write_io", "ruby/io.h")
-have_func("dup3", "unistd.h")
+ok &&= enable_config("io-console-force-compatible-with-1.8") ||
+  macro_defined?("HAVE_RUBY_IO_H", cpp_include("ruby.h"))
 if ok
+  have_header("sys/ioctl.h")
+  have_func("rb_check_hash_type", "ruby.h")
+  have_func("rb_io_get_write_io", "ruby/io.h")
+  have_func("rb_cloexec_open", "ruby/io.h")
+  if enable_config("io-console-rb_scan_args-optional-hash", true)
+    $defs << "-DHAVE_RB_SCAN_ARGS_OPTIONAL_HASH=1"
+  end
   create_makefile("io/console")
 end