This has been fixed in Fedora but not yet in EPEL 7. As there have only been rebuilds since epel7 branched, a simple merge from master, build, and update will suffice.
ncl-6.3.0-6.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2015-efb47e727f
ncl-6.3.0-6.el7 has been pushed to the Fedora EPEL 7 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with $ su -c 'yum --enablerepo=epel-testing update ncl' You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2015-efb47e727f
ncl-6.3.0-6.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.