I see vpnc having older epel branches and builds. I noticed NetworkManager-vpnc already has an epel7 branch, but cannot be built due to missing vpnc. I am following instructions from https://fedoraproject.org/wiki/EPEL_Package_Maintainers and if you prefer I will gladly maintain it in epel7.
*** This bug has been marked as a duplicate of bug 1058393 ***