This is an auto-filled bug because dev-dotnet/libgdiplus fails to compile with format-security. Attached build log and emerge --info
Created attachment 622942 [details] build.log build log
Created attachment 622944 [details] emerge --info emerge --info
cc1: error: '-Wformat-security' ignored without '-Wformat' [-Werror=format-security] That tells you that you're doing it wrong.