<p dir="auto"><strong>Do you want to request a <em>feature</em> or report a <em>bug</em>?</strong><br>
I am not  sure,maybe it's just a question.</p>
<p dir="auto"><strong>What is the current behavior?</strong><br>
I fork the lasted master branch of react,and execute <code class="notranslate">npm run build</code> at the root directory.But get some errors below:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="D:\WebStorm_workspace\react&gt;npm run build

&gt; react-build@16.0.0-alpha.11 build D:\WebStorm_workspace\react
&gt; npm run version-check &amp;&amp; node scripts/rollup/build.js

&gt; react-build@16.0.0-alpha.11 build D:\WebStorm_workspace\react
&gt; npm run version-check &amp;&amp; node scripts/rollup/build.js


&gt; react-build@16.0.0-alpha.11 version-check D:\WebStorm_workspace\react
&gt; node ./scripts/tasks/version-check.js

 STARTING  react.development.js (umd_dev)
-- PARSE_ERROR (undefined) --
Unterminated string constant
{ file: 'D:\\WebStorm_workspace\\react\\src\\isomorphic\\React.js',
  line: 9,
  column: 7 }
undefined

npm ERR! Windows_NT 6.1.7601
npm ERR! argv &quot;D:\\nodejs\\node.exe&quot; &quot;D:\\nodejs\\node_modules\\npm\\bin\\npm-cli.js&quot; &quot;run&quot; &quot;build&quot;
npm ERR! node v6.3.0
npm ERR! npm  v3.10.3
npm ERR! code ELIFECYCLE
npm ERR! react-build@16.0.0-alpha.11 build: `npm run version-check &amp;&amp; node scripts/rollup/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the react-build@16.0.0-alpha.11 build script 'npm run version-check &amp;&amp; node scripts/rollup/build.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the react-build package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     npm run version-check &amp;&amp; node scripts/rollup/build.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs react-build
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls react-build
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     D:\WebStorm_workspace\react\npm-debug.log
"><pre class="notranslate"><code class="notranslate">D:\WebStorm_workspace\react&gt;npm run build

&gt; react-build@16.0.0-alpha.11 build D:\WebStorm_workspace\react
&gt; npm run version-check &amp;&amp; node scripts/rollup/build.js

&gt; react-build@16.0.0-alpha.11 build D:\WebStorm_workspace\react
&gt; npm run version-check &amp;&amp; node scripts/rollup/build.js


&gt; react-build@16.0.0-alpha.11 version-check D:\WebStorm_workspace\react
&gt; node ./scripts/tasks/version-check.js

 STARTING  react.development.js (umd_dev)
-- PARSE_ERROR (undefined) --
Unterminated string constant
{ file: 'D:\\WebStorm_workspace\\react\\src\\isomorphic\\React.js',
  line: 9,
  column: 7 }
undefined

npm ERR! Windows_NT 6.1.7601
npm ERR! argv "D:\\nodejs\\node.exe" "D:\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "run" "build"
npm ERR! node v6.3.0
npm ERR! npm  v3.10.3
npm ERR! code ELIFECYCLE
npm ERR! react-build@16.0.0-alpha.11 build: `npm run version-check &amp;&amp; node scripts/rollup/build.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the react-build@16.0.0-alpha.11 build script 'npm run version-check &amp;&amp; node scripts/rollup/build.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the react-build package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     npm run version-check &amp;&amp; node scripts/rollup/build.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs react-build
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls react-build
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     D:\WebStorm_workspace\react\npm-debug.log

</code></pre></div>
<p dir="auto"><strong>If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via <a href="https://jsfiddle.net" rel="nofollow">https://jsfiddle.net</a> or similar (template: <a href="https://jsfiddle.net/84v837e9/" rel="nofollow">https://jsfiddle.net/84v837e9/</a>).</strong></p>
<p dir="auto"><strong>What is the expected behavior?</strong><br>
Build successfully.</p>
<p dir="auto"><strong>Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?</strong><br>
16.0.0-alpha.11 .Windows.I am not sure whether it is fine in previous versions of React,this is my first build</p>
<p dir="auto">$ npm run build</p>
<blockquote>
<p dir="auto">react-build@16.0.0-alpha.6 build D:\github\react<br>
npm run version-check &amp;&amp; node scripts/rollup/build.js</p>
</blockquote>
<blockquote>
<p dir="auto">react-build@16.0.0-alpha.6 version-check D:\github\react<br>
node ./scripts/tasks/version-check.js</p>
</blockquote>
<p dir="auto">STARTING  react.development.js (umd_dev)<br>
Error: Could not load D:\github\react\node_modules\fbjs\lib\warning (imported by D:\github\react\src\isomorphic\modern\class\ReactNoopUpdateQueue.js): ENOENT: no such file or directory, open 'D:\github\react\node_modules\fbjs\lib\warning'<br>
at D:\github\react\node_modules\rollup\dist\rollup.js:9461:10</p>
<p dir="auto">But I can found the package in the node_modules.(win10 64)</p>