Andreas Pflug <pgadmin(at)pse-consulting(dot)de> writes:
> I just checked out (at the moment hba.c changed, so I had to redo it),
> make clean, make, pgsql stop, make install, pgsql start and it's still
> there.
It works fine for me too. Try removing
src/backend/parser/gram.c and src/backend/parser/parse.h
to force bison to get re-run when you build.
regards, tom lane