Why there is a console window(dos box) showed?

[yau]

I am try to build the openttd 0.5.3 release source code both in release/debug configuration, but the target executable always show a console window(dos box) after it was executed. And, the Tab key can not fast forward the game, but Shift key can. Is some thing must be take care of when building the source code under the release configuration?

[glx]

That means you are using a debug build.