+require 'mkmf'
+require 'rbconfig'
+
+unless $CFLAGS.gsub!(/ -O[\dsz]?/, ' -O3')
+ $CFLAGS << ' -O3'
+end
+if CONFIG['CC'] =~ /gcc/
+ $CFLAGS << ' -Wall'
+ #unless $CFLAGS.gsub!(/ -O[\dsz]?/, ' -O0 -ggdb')
+ # $CFLAGS << ' -O0 -ggdb'
+ #end
+end
+
+if RUBY_VERSION < "1.9"
+ have_header("re.h")
+else
+ have_header("ruby/re.h")
+ have_header("ruby/encoding.h")
+end
+create_makefile 'json/ext/generator'