mjit.gemspec in mjit-0.2.0 vs mjit.gemspec in mjit-0.3.0

@@ -1,11 +1,11 @@
 lib = File.expand_path('../lib', __FILE__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 Gem::Specification.new do |spec|
   spec.name          = 'mjit'
-  spec.version       = '0.2.0'
+  spec.version       = '0.3.0'
   spec.authors       = ['Takashi Kokubun']
   spec.email         = ['[e-mail]']
 
   spec.summary       = %q{Unofficial MJIT utilities}
   spec.description   = %q{Unofficial MJIT utilities}
@@ -15,9 +15,10 @@
   spec.files         = `git ls-files -z`.split("\x0").reject do |f|
     f.match(%r{^(test|spec|features)/})
   end
   spec.bindir        = 'exe'
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  spec.extensions    = ['ext/mjit/extconf.rb']
   spec.require_paths = ['lib']
   spec.required_ruby_version = '> 2.5'
 
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'pry'