Thanks. Hmm, the MultiarchSpec page lists &quot;Co-installable -dev packages&quot; as an unresolved issue, but hasn&#x27;t been updated since 2014. The MultiarchCross[1] page specifically about that issue hasn&#x27;t been updated since 2013. I couldn&#x27;t work out what the current situation is.<p>[1] <a href="https:&#x2F;&#x2F;wiki.ubuntu.com&#x2F;MultiarchCross" rel="nofollow">https:&#x2F;&#x2F;wiki.ubuntu.com&#x2F;MultiarchCross</a>