Compile error with SSH2 support

configure:
./configure --enable-server --enable-agent --with-mysql --with-net-snmp --with-libcurl --prefix=/usr/share/zabbix --with-jabber --with-openipmi --with-ssh2

compile error:
checks_ssh.c: In function 'waitsocket':
checks_ssh.c:64: error: 'LIBSSH2_SESSION_BLOCK_INBOUND' undeclared (first use in this function)
checks_ssh.c:64: error: (Each undeclared identifier is reported only once
checks_ssh.c:64: error: for each function it appears in.)
checks_ssh.c:67: error: 'LIBSSH2_SESSION_BLOCK_OUTBOUND' undeclared (first use in this function)

Debian Lenny, amd64