After emerging emesene: * * Deprecation Warning: Usage of python_mod_optimize() in packages not supporting installation * for multiple Python ABIs in EAPI <=2 is deprecated and will be disallowed on 2011-08-01. * Use EAPI >=3 and call python_mod_optimize() with paths having appropriate syntax. * The ebuild needs to be fixed. Please report a bug, if it has not been already reported. Anyway bump it to new EAPI should be a good idea ;)
version to which you refer should be of the 1.6.x branch that is no longer updated and maintained by developers.
Ebuild has been removed from portage tree