Calligra 2.5.4 was released about a month ago: http://www.calligra.org/news/calligra-2-5-4-released/ Reproducible: Always
Copied ebuild works fine for me on ~amd64 with gcc-4.7.2.
2.5.5 is out which patches a critical bug in sheets: http://www.calligra.org/news/calligra-2-4-4-and-2-5-5-released/ Would have been great if we had 2.5.4 (from Nov. 21) in the tree for testing, so the update to 2.5.5 could get stabilized immediately...
25 Jan 2013; Patrick Lauer <patrick@gentoo.org> +calligra-2.5.5.ebuild: Bump