New version (omg one year since last). Blog post if intersted: http://www.digip.org/blog/2013/09/jansson-2.5-released.html renaming 2.4 works fine for me. tested on amd64.
Yo. Friendly reminder! :-)
Scanned the diff of the source code between 2.4 and 2.5, rename indeed suffices. + 21 Oct 2013; Tom Wijsman <TomWij@gentoo.org> +jansson-2.5.ebuild: + Version bump to 2.5; fixes bug #485916, proxied commit for Johan Bergström. Thank you for your contribution.