Qdirstat is similar to windirstat, so in this link I've found suggestion to use that tool, so I've installed in fedora 20, because want to check files importants in my disk before format.
I faced an issue with qmake which is fixed just running (link)
yum -y install qt-devel
Let's check how to install g++, no remember if I installed it (link).
This site said to install c++
> yum install gcc-c++