Qt Configuration Problem?

Hello Everyone

Hope everyone here will be in good health.;)

I have a couple of questions regarding Qt 4.1.1. I have a opensource version of Qt4.1.1 installed on my system(Windows XP PRO SP2). My questions are

Q1. After installation i write a simple HelloQt code

#include <QApplication>
#include <QLabel>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QLabel *label = new QLabel("Hello Qt!");
label->show();
return app.exec();
}

When i compiled the above program using latest release of MinGW and Qt 4.1.1, the
following two commands run successfully

qmake -project
qmake hello.pro

but following command produces the error

make

The error message is following

mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory `D:/hello'
g++ -mthreads -Wl,-enable-stdcall-fixup -Wl,-enable-auto-import
-Wl,-enable-runt
ime-pseudo-reloc -Wl,-subsystem,windows -o "debug\hello.exe"
debug\hello.o -L"C
:\Qt\4.1.1\lib" -lmingw32 -lqtmaind -lQtGuid4 -lQtCored4
C:\MinGW\bin\..\lib\gcc\mingw32\3.4.2\..\..\..\..\ mingw32\bin\ld.exe:
cannot fin
d -lqtmaind
collect2: ld returned 1 exit status
mingw32-make[1]: *** [debug\hello.exe] Error 1
mingw32-make[1]: Leaving directory `D:/hello'
mingw32-make: *** [debug] Error 2

Q2. What is the purpose of "Build Debug Libraries" option in the start menu.

Q3. Where is the C++ Editor Plugin in the Qt.(in which directory and how to add it???)

Please tell me how to configure Qt4.1.1 step by step. I am in big trouble.

Looking for your kind response.

Best Regards

Muhammad Ammar