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Liviu. You're right. I meant "compiling" in my above post. 

Another tip is, if at make install you get the "make: *** No hay ninguna regla para construir el objetivo `install'. Alto." error (something like "There are no rules to build the target 'install'. Stop.", you have to install g++ compiler "sudo apt-get install g++". Better, install build-essential, "sudo apt-get install build-essential".
   
It includes build libraries commonly used, rather than just g++, but if all you need is the g++ compiler, then installing g++ is enough.

If someone has issues installing Fet 5.28 due to lack of qt 5.5.1, you can use this command without quotes "sudo apt-get install qt5-default". Regards.