Please update it. Thanks.
R-Rcpp-1.0.0-1.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-82ee0183a2
R-Rcpp-1.0.0-1.el6 has been submitted as an update to Fedora EPEL 6. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-64bf8c1eb9
This is already in Fedora stable, and has been in EPEL testing for more than a week.
R-Rcpp-1.0.0-1.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.
R-Rcpp-1.0.0-1.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.