Problems with pgxs

I have some problems when adjusting PL/Java to use PGXS in its
makefiles. Aside from the Win32 problem I asked about earlier, I also
have problems using the MODULE_big. When used, it brings in the
Makefile.shlib and attempts to use the target all-lib. That target is
defined as:

all-lib: all-static-lib all-shared-lib

all-static-lib: $(PTHREAD_H_WIN32)
$(top_builddir)/src/port/pg_config_paths.h lib$(NAME).a

all-shared-lib: $(PTHREAD_H_WIN32)
$(top_builddir)/src/port/pg_config_paths.h $(shlib)

but the $(top_builddir)/src/port directory is non existant in PostgreSQL
installation.

I'm not sure if I use pgxs in a completely wrong way or if pgxs needs
some more work before I can rely on it. Are there any other projects out
there that have their source completely separate from the PostgreSQL
source that uses PGXS succesfully? If so, your input on this subject is
greatly appreciated.

Kind regards,
Thomas Hallgren