From https://lists.fedoraproject.org/pipermail/epel-devel/2014-March/009262.html

rubygem-simplecov-0.7.1-7.el7.noarch requires ruby(abi) >= 0:1.9.1

The last Fedora release to support ruby(abi) was Fedora 18, which is now EOL. Fedora 19 and above require ruby(release) instead.

This section of the spec file should be updated to only Require ruby(abi) on EL6 or below.

  %if 0%{?fedora} >= 19
  Requires:      ruby(release)
  %else
  Requires:      ruby(abi) >= %{rubyabi}
  %endif

I'm filing this against EL7, but since there are multiple maintainers, please be sure that the dist tag conditional gets updated in Rawhide as well so that the spec file is sync'd across all branches.