Created attachment 414876 [details] 1445188376-install-dev-lang_mono-3.12.1:0::gentoo.out this seems to be a bootstrapping issue, because mono is using what is already installed on the system there's also a relevant upstream(?) bug report ==================================================
Created attachment 414878 [details] cave-info.txt
installed is dev-lang/mono-2.10.9-r2
I have an identical error: Mono.Http/NtlmClient.cs(99,54): error CS1502: The best overloaded method match for `Mono.Security.Protocol.Ntlm.Type3Message.Type3Message(byte[])' has some invalid arguments /usr/lib64/mono/gac/Mono.Security/2.0.0.0__0738eb9f132ed756/Mono.Security.dll (Location of the symbol related to previous error) Mono.Http/NtlmClient.cs(99,54): error CS1503: Argument `#1' cannot convert `Mono.Security.Protocol.Ntlm.Type2Message' expression to type `byte[]'
looks solved in 4.4.1.0