Those getting started instructions you link to are for installing the normal, prebuilt, packages of Qt4 on Debian. You should have mentioned that you need Qt5 at the beginning, that changes everything. There is no package of Qt5 for Wheezy available in the standard OS. So what to do?:
One way is to build your own Qt5 installation on the Pi form it's source code as described here: https://wiki.qt.io/Native_Build_of_Qt5_ ... spberry_Pi
. This is what I did about a year ago and it works well. Only problem is the build process is quite complex and took nearly two days to run on my old Pi! Should be down to 8 hours or so on the Pi 2 (There is an update to those instructions here. http://wiki.qt.io/Native_Build_of_Qt_5. ... spberry_Pi
I have made some notes on doing that Qt5 build here http://the.linuxd.org/qt-5-2-for-raspberry-pi/
where I also link to the resulting Qt5.2 binary that you can use immediately.
Another way is to install the Qt5.3 deb packages from here https://twolife.be/raspbian/
Finally there is no need to install qtcreator on the Pi unless you actually want to use that IDE on the Pi. You can simply put your projects source code on the Pi and use the "qmake" and "make" commands to build it. As shown in my blog post.
Oh, I would suggest you use Raspbian on the Pi not Debian. All those instructions given above are known to work on Raspbian, they should also work on Debian but who knows.
Memory in C++ is a leaky abstraction .