def generate_version_h(directory, xml):
    '''generate version.h'''
    f = open(os.path.join(directory, "version.h"), mode='w')
    t.write(f,'''
/** @file
 *	@brief MAVLink comm protocol built from ${basename}.xml
 *	@see http://mavlink.org
 */
#pragma once
 
#ifndef MAVLINK_VERSION_H
#define MAVLINK_VERSION_H

#define MAVLINK_BUILD_DATE "${parse_time}"
#define MAVLINK_WIRE_PROTOCOL_VERSION "${wire_protocol_version}"
#define MAVLINK_MAX_DIALECT_PAYLOAD_SIZE ${largest_payload}
 
#endif // MAVLINK_VERSION_H
''', xml)
    f.close()