Because I don't know enough about libtool to debug it, I backed out
the new libtool override and reinstalled the original libtool15 port
just to test a theory.
Now I can build the libgnome port without error. (I recently posted
that libgnome would not compile because of a missing -pthread flag,
and based on pure speculation I blamed libtool. I take no pleasure
in proving myself correct, however ;o)
So -- can anyone reproduce my findings or (much better) figure out
what's wrong?