Does pg_upgrade really support "make installcheck"?

src/bin/pg_upgrade/TESTING claims (much further down in the file
than I'd like):

The shell script test.sh in this directory performs more or less this
procedure. You can invoke it by running
make check
or by running
make installcheck
if "make install" (or "make install-world") were done beforehand.

However, the second alternative doesn't really work:

$ make installcheck
make: Nothing to be done for `installcheck'.
$

Did this ever work, or could it easily be made to work?
If not, we need to fix that documentation.

regards, tom lane