I've built and pushed the current s3cmd master branch packages into the updates-testing repositories for Fedora 19,  20, rawhide, and EPEL 6.  The F19 and F20 builds should appear tomorrow morning; rawhide and EPEL 6 are there now.

s3cmd-1.5.0-0.3.gitec742180.%{dist}  was built for each dist in { f19, f20, f21, el6}.

If you use Fedora or EL6, please give this a spin and report success/failure.