How to install Qt 4.7 from binary on Ubuntu 11.04

[ibn-tashfin]

I added Qt to my system's path using this command:

export PATH=$PATH:...

export PATH=$PATH:...

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then qmake worked smoothly.

But got one more issue, the make command yield this error:

QApplication: no such file or directory

QApplication: no such file or directory

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I guess that g++ can't locate Qt Libraries.. !

well I found that thread in Ubuntu forums:
http://ubuntuforums.org/archive/index.php/t-231764.html

by asimon
:
....
You need to tell g++ where to find the include files. I.e. something like

$ g++ -I/usr/include/qt4/include foo.cpp

But this is not enough. You also need to tell it what libraries to link against, i.e. something like

$ g++ -I/usr/include/qt4/include -L/usr/lib/include/qt4/lib -lQtGui -lQtCore -lpthread foo.cpp

You should better use some automation here, like for example Qt's qmake. I.e. put your foo.cpp program in a directory called 'foo' and run 'qmake -project'. That will scann the current directory for source files and create a foo.pro project file. Then call 'qmake' which generates a Makefile from the .pro file. Then a simple 'make' will build you program 'foo' and if everything works as expected it should take care of all the needed compiler options.
:
...

So, is it really that g++ can't locate my Qt Libraries? If so, how to solve it?
Or just I didn't add path correctly? If so, how to do it right ?

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@HelderC:

I think better you install it from Synaptic.

Sure it's far better, but installing more than 300 mega bytes with a slow and unstable connection is a big issue for me.

that because I've a slow Internet connection on th Linux machine, so I can't use internet to download it.

Thanks all for replaying.