These are "less" files that compile into the CSS of claro.
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Installing and running on Windows:
1. Install node:
a) Go to https://github.com/ajaxorg/node-builds, press download button, and select "download zip"
b) unzip the file into C:\
2. Add node environment variables:
a) open Control Panel --> click System icon --> select Advanced tab --> click Environment variables button
b) press "edit" on path
c) depending on what directory you unzipped to and the exact filenames, you will add something like
;C:\ajaxorg-node-builds-0fcee7d\win32
4. To compile all the files:
C:\> cd C:\myworkspace\dijit\themes\claro
C:\> node compile.js
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To install/run less version 2 on mac:
1. Install Node.js
Download a built copy from https://github.com/ajaxorg/node-builds.
Alternately, go to http://nodejs.org/#download (./configure, make, make install).
2. Edit .bash_profile etc. to add node to your path
export PATH=$PATH:/opt/less/bin
To compile all the files:
$ cd dijit/themes/claro
$ node compile.js
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See http://lesscss.org/ and https://github.com/cloudhead/less.js/ for more information.