libtool and OBJSUF

Consider the following recipe:

:import libtool

:filetype
        suffix t t

:action compile ltobject t
        :sys cp $source `sufreplace("","_f.c",source)`
        :do compile `sufreplace("","_f.c",source)`

:route t ltobject
        compile

:ltlib foo.la : bar.t { filetype = t } { var_OBJSUF=_f.o }

There's a few things wrong with it, but primarily, the libtool commands ignore 
var_OBJSUF, as AAP shows me dependencies like this:

Aap: 4 - Using dependency "build-FreeBSD4_9_RC/bar.lo{filetype=ltobject} : 
bar.t{filetype=t}{depdir=build-FreeBSD4_9_RC}{var_OBJSUF=_f.o}"

Now if I change ltobject to object and ltlib to program, I get for instance


Aap: 3 - Updating "build-FreeBSD4_9_RC/bar_f.o" from 
"bar.t{filetype=t}{var_OBJSUF=_f.o}{depdir=build-FreeBSD4_9_RC}": it doesn't 
exist


and the whole thing works as expected. What's wrong in libtool that it does 
this (I know, I wrote it and ought to know) ?



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