MVC4 Less Bundle @import Directory

Question

I'm trying to use MVC4 bundling to group some of my less files, but it looks like the import path I'm using is off. My directory structure is:

static/
    less/
        mixins.less
        admin/
            user.less

In user.less, I'm attempting to import mixins.less using this:

@import "../mixins.less";

This used to work for me before when using chirpy with dotless, but now I noticed ELMAH was getting mad at me, saying this:

System.IO.FileNotFoundException: 
    You are importing a file ending in .less that cannot be found.
File name: '../mixins.less'

Am I supposed to use a different @import with MVC4?

Some additional info

Here's the less class and global.asax.cs code I'm using to attempt this:

LessMinify.cs

...
public class LessMinify : CssMinify
{
    public LessMinify() {}

    public override void Process(BundleContext context, BundleResponse response)
    {
        response.Content = Less.Parse(response.Content);
        base.Process(context, response);
    }
}
...

Global.asax.cs

...
DynamicFolderBundle lessFB = 
    new DynamicFolderBundle("less", new LessMinify(), "*.less");
    
BundleTable.Bundles.Add(lessFB);

Bundle AdminLess = new Bundle("~/AdminLessBundle", new LessMinify());
...
AdminLess.AddFile("~/static/less/admin/user.less");
BundleTable.Bundles.Add(AdminLess);
...

Answer 1

I've written a quick blog post about Using LESS CSS With MVC4 Web Optimization.

It basically boils down to using the BundleTransformer.Less Nuget Package and changing up your BundleConfig.cs.

Tested with bootstrap.

EDIT: Should mention the reason I say this, is I also ran into the @import directory structure issue, and this library handles it correctly.