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#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();
}


nox@striker:~/temp$ qmake -project
nox@striker:~/temp$ qmake temp.pro
nox@striker:~/temp$ make
g++ -c -pipe -O2 -Wall -W -D_REENTRANT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/share/qt4/mkspecs/linux-g++ -I. -I/usr/include/qt4/QtCore -I/usr/include/qt4/QtGui -I/usr/include/qt4 -I. -Icwp-1.0.1 -I. -I. -o hello.o hello.cpp
In file included from /usr/include/qt4/QtCore/qbytearray.h:48,
from /usr/include/qt4/QtCore/qstring.h:46,
from /usr/include/qt4/QtCore/qobject.h:48,
from /usr/include/qt4/QtCore/qcoreapplication.h:45,
from /usr/include/qt4/QtGui/qapplication.h:45,
from /usr/include/qt4/QtGui/QApplication:1,
from hello.cpp:1:
/usr/include/string.h:546: error: ‘__locale_t’ has not been declared
/usr/include/string.h:547: error: nonnull argument references non-pointer operand (argument 1, operand 3)
/usr/include/string.h:550: error: ‘__locale_t’ has not been declared
/usr/include/string.h:551: error: nonnull argument references non-pointer operand (argument 1, operand 4)
make: *** [hello.o] Error 1

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qmake temp.pro

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qmake

Just curious, why ...

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#ifdef  __USE_GNU
/* Again versions of a few functions which use the given locale instead
   of the global one.  */                                             
extern int strcasecmp_l (__const char *__s1, __const char *__s2,       
                         __locale_t __loc)                             
     __THROW __attribute_pure__ __nonnull ((1, 2, 3));                 

extern int strncasecmp_l (__const char *__s1, __const char *__s2,
                          size_t __n, __locale_t __loc)         
     __THROW __attribute_pure__ __nonnull ((1, 2, 4));           
#endif


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#ifdef  __USE_GNU
#include <xlocale.h>