• get a 'gem2rpm' script
• Fetch gem you want to package, like

gem fetch sinatra

• Run gem2rpm

sinatra-1.0.gem > rubygem-sinatra.spec

• Now edit this specfile, and change things like:

s/%define/%global

• Check of spec file is good with Fedora Package Guidelines
• Eventually check against Ruby Packaging Wiki
• Then build it using:

rpmbuild -ba rubygem-sinatra.spec

• SRPM appears under ~/rpm-devel/SRPMS
• Check SRPM and RPM using rpmlint and fix all errors
• Then submit a new package review request using this site
• Wait random amount of hours to mtasaka appear ;-)
• After Mamoru approve your package, you request for import into GIT
• Then you need to checkout this package from GIT, build it and submit into testing
• After some time you need to gather karma in bodhi and then push package as stable