Current notify-sharp3 for EPEL7 (notify-sharp3-3.0.3-2.el7) requires mono(mscorlib) = 0:2.0.0.0 EPEL7 has an updated to mono-core which contains mono(mscorlib) = 4.0.0.0 Please fix this package so that it can be installed in RHEL 7.6. If you have not responded in a week, we will have a proven packager fix it. If you know you will not be able to get to it and would like it fixed sooner, please let us know in this bug. If you feel this package should no longer be in EPEL7, please let us know in this bug.
I have verified via scratch build, that a simple rebuild will allow this package to be installed. But, several of it's dependencies are only built on x86_64 and need to be rebuilt on all supported EPEL7 arches. Specifically, the following packages need to be rebuilt in EPEL7 before this package can successfully be rebuilt. dbus-sharp-glib gnome-sharp gtk-sharp3
notify-sharp3-3.0.3-3.el7 has been submitted as an update to Fedora EPEL 7. https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-bff17e8331
notify-sharp3-3.0.3-3.el7 has been pushed to the Fedora EPEL 7 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2018-bff17e8331
notify-sharp3-3.0.3-3.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.