Hello and sorry for the late feedback ... lots of things going on ... 

On 14. Jan 2020, at 16:45, Maria Matějka <maria.matejka@nic.cz> wrote:

however, attempts to build it without /--disable-libssh/ result in a linking error:

Oops, sorry, I missed one include. Here is the fixed patch, now it compiles both with and without libSSH.

Maria
<no-ssh-2.patch>

No, unfortunately it does not - not any more, at least:

Configured with

./configure --disable-libssh

it doesn't compile proto/rpki/ssh_transport.c because it references "struct ssh_sock" and "SK_SSH_CONNECT", whose definitions are excluded in lib/socket.h unless HAVE_LIBSSH is defined →

CC -o obj/proto/rpki/ssh_transport.o -c proto/rpki/ssh_transport.c

proto/rpki/ssh_transport.c: In function 'rpki_tr_ssh_open':

proto/rpki/ssh_transport.c:29:40: error: invalid application of 'sizeof' to incomplete type 'struct ssh_sock'

   sk->ssh = mb_allocz(sk->pool, sizeof(struct ssh_sock));

                                        ^~~~~~

proto/rpki/ssh_transport.c:30:10: error: dereferencing pointer to incomplete type 'struct ssh_sock'

   sk->ssh->username = ssh_cf->user;

          ^~

proto/rpki/ssh_transport.c:34:20: error: 'SK_SSH_CONNECT' undeclared (first use in this function)

   sk->ssh->state = SK_SSH_CONNECT;

                    ^~~~~~~~~~~~~~

Again: Thanks for your great support!

Clemens