Is it possible to append another value to existing variable in sass / scss? : <p>I have this defined in an external file of a framework I am using:</p>

<pre><code>$font-family-sans-serif: "Helvetica Neue", "Roboto", "Segoe UI", sans-serif !default;
</code></pre>

<p>I want to prepand my own font (in a different file , e.g, without altering the FW variables file).</p>

<pre><code>$font-family-sans-serif: 'MyFont', $font-family-sans-serif;
</code></pre>

<p>So, is it possible? The above is not working.</p>

<pre><code>Error: Undefined variable: "$font-family-sans-serif".
        on line 3 of scss/variables.scss
        on line 3 of scss/variables.scss
&gt;&gt; $font-family-sans-serif: 'MyFont', $font-family-sans-serif;
</code></pre>
