national_grid.gemspec in national_grid-0.1.0 vs national_grid.gemspec in national_grid-0.1.1

@@ -12,9 +12,10 @@
   spec.license       = "MIT"
 
   spec.files         = `git ls-files -z`.split("\x0")
   spec.test_files    = spec.files.grep(%r{^test/})
   spec.require_paths = ["lib"]
+  spec.extensions    = ["ext/national_grid/extconf.rb"]
 
   spec.add_development_dependency "bundler", "~> 1.5"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rake-compiler"
   spec.add_development_dependency "minitest", "~> 5.3"