kakasi fails to cross build from source, because configure.in contains
an AC_RUN_IFELSE with no alternative for cross compilation. The check at
hand is a sanity check trying to figure out whether iconv works. It
really cannot be performed in a cross compilation setting. However, its
outcome does not influence the build result. When it fails, configure
exits with an error. I suggest acknowledging this and skipping it during
cross compilation only. Once doing so, kakasi can be cross built. Please
consider applying the attached patch and forwarding it upstream.

Helmut