So I went ahead and created an ebuild package file for Gentoo. This is a live ebuild. It installs a desktop file and icon along with the executable.

Note that this is terribly written, but it works.

Usage instructions are standard, just plop it into your custom portage tree, in my case /usr/local/portage/games-simulation/the-powder-toy/the-powder-toy-999.ebuild, and then build the manifest like usual.

The only use flag available is "sse", what it does should be fairly obvious.

The ebuild:

http://server.triclops200.com/MiningMarsh/the-powder-toy-9999.ebuild