Gentoo's Bugzilla –
Attachment 579536 Details for
Bug 687864net-mail/cyrus-imapd-3.0.10-r1[xapian]: /usr/include/unicode/ucnv.h:585:1: error: conflicting declaration of C function ‘void icu::swap(icu::LocalUConverterPointer&, icu::LocalUConverterPointer&)’