Comment out unused variable.
@@ -23,7 +23,7 @@ MRuby::Gem::Specification.new('mruby-test') do |spec|
mrbtest_objs = []
driver_obj = objfile("#{build_dir}/driver")
- driver = "#{spec.dir}/driver.c"
+ # driver = "#{spec.dir}/driver.c"
assert_c = "#{build_dir}/assert.c"
assert_rb = "#{MRUBY_ROOT}/test/assert.rb"
