How To: exclude less files?

[ghost]

I have a structure where 10 less files are imported into main.less

main.less
    ı-- main.css
modules [dir]
     mod-1.less
     mod-2.less
     ...

I'd like to auto-generate main.css from main.less every time a less file is saved, but not generate individual mod-x.css files for each less file. How do I do this?

[madskristensen]

add an underscore as the first character in the file name, for example _mod-1.less