Description:
When attempting to use the rpki protocol introduced bird2.0, a "syntax error" is produced.
Upon inspection of the bird source it appears that a new dependency was introduced with v2.0: libssh
If libssh is absent then the rpki protocol is disabled at compile time.
Re-building the package with libssh added as a dependency to the PKGBUILD results in the rpki protocol being present and functional.

Additional info:
* package version(s): 2.0.0-2
* config and/or log files etc.

Minimum required to cause the problem:
router id 192.168.1.1;
roa4 table r4;
roa6 table r6;
protocol rpki {
roa4 { table r4; };
roa6 { table r6; };
remote "validator.rpki.net.nz" port 8282;
retry keep 5;
refresh keep 30;
expire 600;
}


Steps to reproduce:
Put the example config above into /etc/bird.conf, try to start it.
Expected behaviour, with this minimal config file, is to have bird start and pull in rpki data.