My exception list was incomplete, I had not added what licenses were exempt.<br />The following now works:<br /><br />
<div style="color: #cccccc; background-color: #1f1f1f; font-family: 'Droid Sans Mono', 'monospace', monospace; line-height: 19px; white-space: pre;">
<div>INCOMPATIBLE_LICENSE_EXCEPTIONS += <span style="color: #ce9178;">"gdb:GPL-3.0-only gdb:LGPL-3.0-only"</span></div>
</div>