I can't get autofs working with nisplus.

/etc/auto.master looks like this:

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/users	nisplus:auto_users.org_dir	-nosuid,hard,intr,noquota
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The output of `niscat auto_users.org_dir` is as follows:

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a alpha:/export/users/a
b beta:/export/users/b
c gamma:/export/users/c
z
sync:/export/users/z                                                          
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When I try to cd to /users/z, I get the following error in the syslog:

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Nov 30 14:09:26 anno automount[31162]: attempting to mount entry /users/z
Nov 30 14:09:26 anno automount[31299]: lookup(nisplus): lookup for z
failed: Not found
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I have traced the problem down to the file modules/lookup_nisplus.c.

        sprintf(tablename, "[key=%s],%s.org_dir.%s", name, ctxt->mapname,
                ctxt->domainname);
 
        result =
            nis_list(tablename, FOLLOW_PATH | FOLLOW_LINKS, NULL,
NULL);        

nis_list returns 29: NIS_BADATTRIBUTE.

When I change that into
	sprintf(tablename, "%s.org_dir.%s, ctxt->mapname, ctxt->domainname);
and ommit the ".org_dir" in /etc/auto.master, I get an successfull look_up,
but a wrong mount.  alpha:/export/users/a will be mounted on /users/z,
instead of sync:/users/z.  In fact, the above nis_list statement returns
the content of the entire nisplus map, and only the first entry is used. 
Obviously the "[key=%s]", name is needed, but the syntax appears to be
wrong. 

Same in autofs-3.1.6.