qt - Qt5 programs won't compile -

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i'm trying qt5 working on ubuntu 12.04. downloaded 32-bit installer http://qt-project.org/downloads , let install in home folder.

i had add ~/qt/5.1.0/gcc/bin path qmake work, when try make hello qt example (using qt4 book), when running make, cannot find qapplication or qlabel header. when replace them qtwidgets/qapplication, finds header, undefined references when linking.

this command make executes:

g++ -c -pipe -o2 -wall -w -d_reentrant -fpie -dqt_no_debug -dqt_gui_lib -dqt_core_lib -i../../../../qt/5.1.0/gcc/mkspecs/linux-g++ -i. -i. -i../../../../qt/5.1.0/gcc/include -i../../../../qt/5.1.0/gcc/include/qtgui -i../../../../qt/5.1.0/gcc/include/qtcore -i. -o hello.o hello.c

i managed figure out it's qmake -project doing wrong. when make app in qt creator (which works), .pro file has lines qt += widgets, not there when run on command line.

i found answer using qmake --help. says:

note: created .pro file need edited. example add qt variable specify modules required.

adding these lines .pro file solved problem:

qt += core gui qt += widgets

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