ext/extconf.rb in tuple-0.1.1 vs ext/extconf.rb in tuple-0.1.2

@@ -1,10 +1,20 @@
 require 'mkmf'
+
+case RUBY_VERSION
+when /\A1\.8/
+  $CFLAGS += ' -DRUBY_1_8_x'
+when /\A1\.9/
+  $CFLAGS += ' -DRUBY_1_9_x'
+else
+  raise "unsupported Ruby version: #{RUBY_VERSION}"
+end
+
 create_makefile('tuple')