[Glass] FFI and C subsystems

[bruno buzzi brassesco]

Martin,

>   I don't know about server.h -- in my system the only headers with 
> that name are unrelated to libssh.so.

In Libssh 4.8.5 (project version 0.9.4 
https://www.libssh.org/files/0.9/libssh-0.9.4.tar.xz) this is the API 
for server.h:
https://api.libssh.org/stable/group__libssh__server.html

The server.h should be located in: ../libssh-0.9.4/include/libssh

regards,
bruno