Umm, ok so I compiled it and got rpg2kdev.exe, but all it does is generate a BMP from a map. I googled for "rpg2kdev.exe" and I know I didn't misuse it because I found a post even in this forum:
http://www.gamingw.net/forums/index.php?topic=69046.msg1252601#msg1252601
Basically what we got here is a program called LMU2BMP... Since the page is japanese, maybe I just downloaded the wrong thing?
Looking at the download page you linked, this is what I downloaded:
rami, LMU2BMP is a software that converts your rpgmaker maps into bmp images, it makes it really easy to take screenshots of your map (especially if its huge), before we used to printscreen the editor and (then edit it in paint), now we can just use lmu2bmp to take a direct shot of the map.
so yeah, thought i'd clear that out xD
edit:
HOLD THE PHONE!!!
Neophyte, are you ABSOLUTELY SURE this is the right page? Because I don't think so, it seems that rami compiled the right program, because, THIS is what is reads (translated)
Currently in development, but is still below what you can.
* マップデータの入力 Map data input
* BMP,PNG,XYZの入出力。 BMP, PNG, XYZ input and output.
So im thinking is really IS the source code for the lmu2bmp prog, and not the rm2k3 one!!