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Editorial Team
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Asked: 2026-06-04T04:50:48+00:00

I am writing this simple Qt application, but it is showing the following errors.

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I am writing this simple Qt application, but it is showing the following errors.
Can anyone explain me why I am getting these errors? Below is the code snippet:

#include <QTextStream>

int main()
{
   QTextStream out(stdout);
   out << "console application\n";
}

Steps followed to compile:

qmake -project 
qmake .pro file 
make

After following the above mentioned steps, below is the output that I’m getting:

g++ -c -pipe -g -Wall -W -O2 -D_REENTRANT  -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/share/qt3/mkspecs/default -I. -I. -I/usr/include/qt3 -o text.o text.cpp
text.cpp:1:23: error: QTextStream: No such file or directory
text.cpp: In function ‘int main()’:
text.cpp:5: error: ‘QTextStream’ was not declared in this scope
text.cpp:5: error: expected ‘;’ before ‘out’
text.cpp:6: error: ‘out’ was not declared in this scope
make: *** [text.o] Error 1

Platform: Linux

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1 Answer

  1. Editorial Team

    Use qmake and make instead of manually invoking the compiler.

    cd YourProject/
qmake -project
qmake
make
./YourProjectTarget

    and make sure the qmake version you’re invoking is the Qt4 version, not the Qt3. You seem to have both versions installed, and you’re probably invoking the Qt3 one.

    Try this:

    qmake -version

    The output should be something like this

    QMake version 2.01a
Using Qt version 4.8.1 in /usr/lib/x86_64-linux-gnu

    To be sure you’re invoking the right qmake (Qt4), usually you can replace qmake commands with qmake-qtX, where X is the Qt version. 

    cd YourProject/
qmake-qt4 -project
qmake-qt4
make
./YourProjectTarget
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