lLnk to http://nodejs.org/download/ and add a short primer on how to
extract the tarballs.
Fixes #6292.
vcbuild.bat
+You can download pre-built binaries for various operating systems from
+[http://nodejs.org/download/](http://nodejs.org/download/). The Windows
+and OS X installers will prompt you for the location to install to.
+The tarballs are self-contained; you can extract them to a local directory
+with:
+
+ tar xzf /path/to/node-<version>-<platform>-<arch>.tar.gz
+
+Or system-wide with:
+
+ cd /usr/local && tar --strip-components 1 -xzf \
+ /path/to/node-<version>-<platform>-<arch>.tar.gz
+
### To run the tests:
Unix/Macintosh: