Here is a ebuild for nsis. It is a dev-util to create install.exe for windows but it can run under GNU/Linux.
Created attachment 88642 [details] nsis-2.17.ebuild
This is now in the sunrise overlay. You can find it at: http://gentoo-sunrise.org/svn/reviewed/dev-util/nsis
Update to nsis-2.19
dev-util/nsis-2.21 is now in the portage tree. Good job, C
dev-util/nsis-2.21 is now in the portage tree. Good job, Cédric! However, I had to make 2 changes: - expand config patch (to avoid pre-stripped QA warning for makensis and GenPat) - correct fperms command If you feel like it, you are more than welcomed as co-maintainer of nsis. Please remove it from Sunrise.