Impossible to use uikit-mixins

[Tolomeo]

Hi,
it seems like it's impossible to use framework mixin definitions to extend or override ui-kit capabilities, like:

@mixin hook-button-misc(){

    /*
    * Modifier: `uk-button-warning`
    */
    .uk-button-warning {
        background-color: $button-warning-background;
        color: $button-warning-color;
    }
    /* Hover */
    .uk-button-warning:hover,
    .uk-button-warning:focus {
        background-color: $button-warning-hover-background;
        color: $button-warning-hover-color;
    }
    /* Active */
    .uk-button-warning:active,
    .uk-button-warning.uk-active {
        background-color: $button-warning-active-background;
        color: $button-warning-active-color;
    }

}

I think due to the fact that uikit-mixins scss gets imported within uikit scss and all the custom mixins get overridden.
Can you see that?