Mingw doesn't find qt include files

[NineTailFox]

Hi, i've installed QT free version on windows XP and tried to compile files using make tool.
Yesterday I succeeded, but today Mingw cannot find QT header files,
showing messages like
QApplication:no such or directory found:(
I amnot familiar with mingw pathes , so hope for you help

[pastor]

What environment variables did you set?

[calhal]

Try to compile your project using Start->Programs->Qt by Nokia 4.x.x->Qt 4.x.x Command Prompt

When you run this command prompt you'll see "Setting up a Qt environment" on the top of the console. You can add these variables to system's environment variables.