Updated to match the latest version in node (added writeable: true, configurable: true, which have been in node since 0.4.9 https://github.com/joyent/node/commit/1ba2c321, also added `super_` which has been in node since the beginning, apparently)

inherits.js

/**
 * Inherit prototype properties
 * @param {Function} ctor
 * @param {Function} superCtor
 */
_.mixin({
    inherits: (function(){
        function noop(){}
     
        function ecma3(ctor, superCtor) {
            noop.prototype = superCtor.prototype;
            ctor.super_ = superCtor;
            ctor.prototype = new noop;
            ctor.prototype.constructor = ctor;
        }
        
        function ecma5(ctor, superCtor) {
            ctor.super_ = superCtor;
            ctor.prototype = Object.create(superCtor.prototype, {
                constructor: {
                    value: ctor,
                    enumerable: false,
                    writable: true,
                    configurable: true
                }
            });
        }
        
        return Object.create ? ecma5 : ecma3;
    }())
});

FYI: I just discovered https://github.com/isaacs/inherits, which has an identical implementation to this fork but should be preferred because it is in a github repo, is maintained and is used by browserify.