dev-ruby/
sfl

Library providing spawn() which is almost perfectly compatible with ruby 1.9's

https://github.com/ujihisa/spawn-for-legacy

There are no pull requests

You think something is missing here?
Start with filling a new pull requests.

If you also like to help the Gentoo project, you can consider sending a Pull Request via GitHub.
Before doing so, you might want to take a look at the wiki page.