diff --git a/bin/build.js b/bin/build.js
index f8517bf..52316a2 100755
--- a/bin/build.js
+++ b/bin/build.js
@@ -2,19 +2,19 @@
 'use strict';
 
 const fs = require('fs-extra');
-// const cp = require('child_process');
+const cp = require('child_process');
 const llparse = require('llparse');
 
-// const gyp = cb => {
-//   console.log('build');
-//   const proc = cp.spawn('node-gyp', ['configure', 'build']);
-//   proc.stderr.on('data', data => {
-//     console.error(data.toString());
-//   });
-//   proc.on('close', (cb || (() => {
-//     console.log('done');
-//   })));
-// };
+const gyp = cb => {
+  console.log('build');
+  const proc = cp.spawn('node-gyp', ['configure', 'build']);
+  proc.stderr.on('data', data => {
+    console.error(data.toString());
+  });
+  proc.on('close', (cb || (() => {
+    console.log('done');
+  })));
+};
 
 const objection = lut => arg => arg.split(/\s+/).reduce((res, key) => {
   if (lut[key] === undefined) {
@@ -43,7 +43,7 @@ const properties = {
   napi_env:     'ptr'
 };
 
-const generate = (/* cb */) => {
+const generate = (cb) => {
   // const llparseDot = require('llparse-dot');
 
   const prj = 'vcd_parser';
@@ -281,9 +281,9 @@ const generate = (/* cb */) => {
   // const dot = new llparseDot.Dot();
   // fs.writeFileSync(prj + '.dot', dot.build(declaration));
 
-  // cb();
+  cb();
 };
 
-generate(/* gyp */);
+generate(gyp);
 
 /* eslint camelcase: 0 */