Win32 development question

I am wanting to fiddle with the latest Win32 stuff, using the Mingw
tools.
Is it included in the current (2-17-04) snapshot?

I did a download of the tarball and expanded it.
I changed directory to the /postgresql-snapshot directory and performed
a ./configure

configure: creating ./config.status
config.status: creating GNUmakefile
config.status: creating src/Makefile.global
config.status: creating src/include/pg_config.h
config.status: linking ./src/backend/port/tas/dummy.s to
src/backend/port/tas.s
config.status: linking ./src/backend/port/dynloader/win32.c to
src/backend/port/dynloader.c
config.status: linking ./src/backend/port/sysv_sema.c to
src/backend/port/pg_sema.c
config.status: linking ./src/backend/port/sysv_shmem.c to
src/backend/port/pg_shmem.c
config.status: linking ./src/backend/port/dynloader/win32.h to
src/include/dynloader.h
config.status: linking ./src/include/port/win32.h to
src/include/pg_config_os.h
config.status: linking ./src/makefiles/Makefile.win32 to
src/Makefile.port

Make fails:

$ make
src/Makefile.global:275: src/Makefile.port: No such file or directory
make: *** No rule to make target `src/Makefile.port'. Stop.

What is necessary in order to fool around with the Win32 stuff?
From the above symbolic link formation, it seems like it should have
found the file.