compiling qt program

I created a project and simple program in QTDesigner but do not know how to compile it.
What are the steps involved in compiling such a program. Can I use Kdevelop?
Here is the program.

Code:

---

#include <qapplication.h>
#include <qpushbutton.h>

int main(int argc, char **argv)
{
    QApplication a(argc,argv);
    QPushButton hello("Hello World");
   
    hello.resize(100,30);
   
    a.setMainWidget(&hello);
    hello.show();
    return a.exec();
}

---

I think I figured out part of the process but I am still having problems.
1. I set the path variable to include the qmake program
2. I ran qmake -o Makefile helloworld.pro
3. I ran make

I get linking related errors
such as qapplication.h no such file or directory.

once again im stuck

I'm not familiar with the application in question, but if it doesn't know wher et o look for the header, then that couild be a problem. running:

Code:

---

locate qapplication.h

---

may help. Now, where you would enter such information , i am clueless. Hope this helps.

~Inquirer

I finally succeded in getting the make file to work, by including a variable
QTDIR = /usr/lib/qt3
could I create an environmental variable for QTDIR instead so I wouldn't have to edit the make file each time? I'll try it
Anyhow the code listed above has a problem with the QPushButton hello("hello world");

Code:

---

#include <qapplication.h>
#include <qpushbutton.h>

int main(int argc, char **argv)
{
    QApplication a(argc,argv);
    QPushButton hello("Hello World");
   
    hello.resize(100,30);
   
    a.setMainWidget(&hello);
    hello.show();
    return a.exec();
}

---

helloworld.cpp: In function `int main(int, char**)':
helloworld.cpp:8: no matching function for call to `QPushButton::QPushButton(const char[12])'
/usr/lib/qt3/include/qpushbutton.h:134: candidates are: QPushButton::QPushButton(const QPushButton&)
/usr/lib/qt3/include/qpushbutton.h:66: QPushButton::QPushButton(const QIconSet&, const QString&, QWidget*, const char* = 0)
/usr/lib/qt3/include/qpushbutton.h:65: QPushButton::QPushButton(const QString&, QWidget*, const char* = 0)
/usr/lib/qt3/include/qpushbutton.h:64: QPushButton::QPushButton(QWidget*, const char* = 0)
can anyone help me out with this bug I took the program from the kdevelop manual so I wouldn't think there should be errors I understand I have an incorrect parameter const char but does anyone know how to create such a button correctly?