The object for windows can be used from Version 1.6.2. (+patch)

http://www.ossp.org/pkg/lib/uuid/
-- 
Great developer: Ralf S. Engelschall

Note: Please apply patch.(update:2008.08.24)
patch -p0 <uuid-1.6.2_win32_patch2

How to build.:

1. Deployment of tar.gz
2. apply the patch
3. configure and build by Linux or MinGW
4. config.h and win32.mak are set at the head of a source tree.
5. nmake -f win32.mak 

-- run test --
postgres=# SELECT uuid_generate_v3(uuid_ns_url(), 'http://www.postgresql.org');
           uuid_generate_v3
--------------------------------------
 cf16fe52-3365-3a1f-8572-288d8d2aaa46
--

and,
--
-- ossp-uuid test
--
CREATE OR REPLACE FUNCTION test_uuid(gen INTEGER)
  RETURNS VOID AS $$
BEGIN
 FOR i IN 1..$1 LOOP
  RAISE INFO 'uuid = %', uuid_generate_v4();
 END LOOP;
END;
$$
LANGUAGE 'plpgsql';

postgres=# CREATE OR REPLACE FUNCTION test_uuid(gen INTEGER)
postgres-#   RETURNS VOID AS $$
postgres$# BEGIN
postgres$#  FOR i IN 1..$1 LOOP
postgres$#   RAISE INFO 'uuid = %', uuid_generate_v4();
postgres$#  END LOOP;
postgres$# END;
postgres$# $$
postgres-# LANGUAGE 'plpgsql';
CREATE FUNCTION
postgres=# SELECT test_uuid(10);
INFO:  uuid = 427c6f3e-9876-48c5-b44d-776771f7c2c9
INFO:  uuid = fbab93a8-44d2-4f52-b6ae-01396c6ee17e
INFO:  uuid = d82be630-d2e8-4662-b6ea-db8c56121024
INFO:  uuid = 33689404-2da8-4a8d-9b94-6aeb284be347
INFO:  uuid = cd7d10b7-23fa-40df-af74-53314dae235c
INFO:  uuid = 80934b57-4cf4-4ab5-b915-f41f22054265
INFO:  uuid = abd6f205-1a49-4f4f-b854-c7d611533401
INFO:  uuid = 2dd64cbc-ee86-419e-ba09-ae538f60cc5a
INFO:  uuid = 751ee0fe-d5ae-473f-b22f-e14c9066fadd
INFO:  uuid = 0d36e47d-c065-4717-96f0-82f53f610a9a
 test_uuid
-----------

(1 row)

	Name	Last modified	Size	Description
	Parent Directory		-
	win32.mak	2011-05-18 23:38	2.7K
	uuid-1.6.2_win32_patch2	2010-03-07 11:15	3.3K
	uuid-1.6.2.tar.gz	2008-07-05 06:53	388K
	psqlODBC_UUID/	2010-03-07 11:33	-
	config.h	2011-05-18 23:39	2.4K
	build-x86-64/	2011-05-20 23:40	-
	build-x86-32/	2011-05-20 23:39	-

Hiroshi Saito(hiroshi@winpg.jp)