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 use Net::OpenSSH::Compat::SSH2 qw(:supplant);
use Net::SSH2;

...
my $res = $ssh2->auth(username => $username,
                      password => $password,) or die "$!",$ssh2->error
+;
print "result is $res\n";

 > perl compatssh2.pl 
# ctl_path: /home/smokes/.libnet-openssh-perl/regression-192.168.2.-11
+175-417065, ctl_dir: /home/smokes/.libnet-openssh-perl/
# _is_secure_path(dir: /home/smokes/.libnet-openssh-perl, file mode: 1
+6832, file uid: 1003, euid: 1003
...
# waitpid(master: 11177) => pid: 11177, rc: Interrupted system call
# DESTROY(Net::OpenSSH=HASH(0xdb75b0), pid: <undef>)
Interrupted system callLIBSSH2_ERROR_SOCKET_DISCONNECTunable to establ
+ish master SSH connection: the authenticity of the target host can't 
+be established, the remote host public key is probably not present on
+ the '~/.ssh/known_hosts' file at compatssh2.pl line 13.