[zfs-code] does libzfs header in Solaris 10U5 match the code?

[Ian Collins]

I have to build an application I have written on SXCE on Solaris 10 update 5 
and I've hit a snag with the prototype for zfs_send:

#pragma ident   "@(#)libzfs.h   1.4     08/01/09 SMI"

extern int zfs_send(zfs_handle_t *, const char *, int);

which appears to predate incremental snapshots.

Is this the correct prototype for the supplied libzfs?  If so, how were 
incremental sends implemented?
 
Thanks,

-- 
Ian.