USES=iconv Q/A issues: ...not declared as a dependency

Hello,

I'm having some troubles with audio/strawberry port at PR265290
<https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265290> regarding Q/A
tests related with USES=iconv that is present in port:
---
====> Running Q/A tests (stage-qa)
Error: /usr/local/bin/strawberry is linked to /usr/local/lib/libiconv.so.2
from converters/libiconv but it is not declared as a dependency

Warning: you need USES+=iconv, USES+=iconv:wchar_t, or USES+=iconv:translit
depending on needs
---

I've did run some tests and both 'iconv:wchar_t' and 'iconv:translit' pets
Q/A tests (but 'iconv' do not).

Need some hints to find the correct USES for this port.

Thanks in advance,

Nuno Teixeira