Error: spawn ENOTSUP when installing socket.io with npm install

If you have installed node.js v0.6.16 for Windows and you want to install socket.io with the following command:

npm install socket.io

Then it could happen that you will get this error message on Windows 7 (64-Bit):

> node install.js
 
npm ERR! Error: spawn ENOTSUP
npm ERR!     at errnoException (child_process.js:483:11)
npm ERR!     at ChildProcess.spawn (child_process.js:446:11)
npm ERR!     at Object.spawn (child_process.js:342:9)
npm ERR!     at spawn (C:\Program Files (x86)\nodejs\node_mod
npm ERR!     at exec (C:\Program Files (x86)\nodejs\node_modu
npm ERR!     at Array.0 (C:\Program Files (x86)\nodejs\node_m
npm ERR!     at EventEmitter._tickCallback (node.js:192:40)

Fortunately, there is a solution! Open this file:

C:\Program Files (x86)\nodejs\node_modules\npm\lib\utils\exec.js

Replace these two lines (around line 109 & 110):

  if (!isNaN(uid)) opts.uid = uid
  if (!isNaN(gid)) opts.gid = gid

That’s all. For more information see: Error on socket.io installing on Windows 7.

With these ones:

  if (uid && !isNaN(uid)) opts.uid = +uid
  if (gid && !isNaN(gid)) opts.gid = +gid

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