The package media-gfx/icoutils is now located at http://www.nongnu.org/icoutils/ (the old address, specified in the ebuild, gives a 404 error). Furthermore, the version 0.26.0 is available (Changelog: http://www.nongnu.org/icoutils/news.html).
Created attachment 82132 [details, diff] Patch for icoutils-0.23.0 to bump version to 0.26.0 I changed the website address and added some einfo about optional dependencies and the name of the main tool (as it is different from the package name). Compiles finely on x86.
Thanks for the submission, I added the perl stuff to RDEPEND instead of using your pkg_postinst block. In CVS now.