9999 ebuild is obsolete, for example, it's asking for older freerdp than 2.0.0_pre20160722 needs. Then, it should be either updated, or removed if it's too difficult to keep updated Thanks
Please go ahead and drop it. I don't think it is worth it to maintain a live ebuild now that they are making releases every couple of months.
[master 0235806] net-misc/remmina: Drop live ebuild (#602134) and unused patch. 2 files changed, 98 deletions(-) delete mode 100644 net-misc/remmina/files/remmina-external_tools.patch delete mode 100644 net-misc/remmina/remmina-9999.ebuild