hello$ make
g++ -c -pipe -g -fvisibility=hidden -fvisibility-inlines-hidden -Wall -W -O2 -D_REENTRANT  -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/share/tqt3/mkspecs/default -I. -I. -I/usr/include/tqt3 -o hello.o hello.cpp
hello.cpp:1:26: fatal error: qapplication.h: No such file or directory
 #include <qapplication.h>
                          ^
compilation terminated.
Makefile:67: recipe for target 'hello.o' failed
make: *** [hello.o] Error 1