but I got the error 'LC_MESSAGES' : undeclared identifier
locale.h only defines LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, LC_TIME
I tried to set a system variable LC_MESSAGES, but didn't work
Then, I tried to find more information
In libpq, when ENABLE_NLS is not defined, #define libpq_gettext(x) (x)
If I set ENABLE_NLS to 1, then I think I need the gettext library, because it needs < libintl.h>
so, there is no simple way in windows to get messages in spanish within libpq before connecting to server, is correct?
Well libpq like rest of postgres uses gettext for i18N , so i think you need to have your windows locale set to spanish, have the gettext library installed and spanish message catalogs available on your system, which will be if you compiled the source with --enable-nls configure option then it doesn't matter if the connection was made to the server or not, since libpq has its own translated messages catalog.
