Created attachment 160502 [details]
xtrabackup itself makes no iconv calls and does not use any iconv header. The only usages that I could find are in the bundled libarchive, but it is built with expat instead of libxml2, so it ends up not being used at all.
Created attachment 161052 [details]
Update to 2.2.12
Could you please update the port to 2.2.12 at the same time? I have attached a patch including the suggested dependency change from Raphael.
That works for me too. We'll just have to wait a little longer to land everything separately (the official period for a maintainer timeout is 14 days).
The dropping of USES=iconv should probably be MFH'd, whereas the version update shouldn't
A commit references this bug:
Date: Thu Oct 29 13:47:34 UTC 2015
New revision: 400459
Update to 2.2.12. 
Remove unneeded bits from the past.
Submitted by: maintainer
Sponsored by: Absolight