Hi,
I'm not sure if what I've noticed fully qualifies as a bug...but, I run cygwin and also do a lot of development with vc++ (6)...Using version 7.2.1 I built the libpq++ libs/dll for win32 for use in my vc++ progs, and also ran the 'configure' script under cygwin...the problem occurs in the pg_config_os.h file, where an "#include <cygwin/version.h>" occurs before an "#ifdef __CYGWIN__" - so naturally my vc++ builds fail. By moving the include to after the ifdef the problem goes away...I thought I'd send this here so somwone with knowledge of patching the configure scripts etc. might have a look.
Regards,
Scott