To construct the spectrumviewer adapt the ".pro" file to your needs For the devices included (by uncommenting the appropriate lines in the ".pro" file) you need to install the appropriate libraries
The CMakelists.txt was tested as well.
####################################################################### Note on DABstick software
I had (far) better results using an RT820T based dabstick with generating a library from http://www.rtl-sdr.com/new-experimental-r820t-rtl-sdr-driver-tunes-13-mhz-lower/ ###########################################################################
One may also look at the work of Leif for Linrad
http://www.sm5bsz.com/linuxdsp/hware/rtlsdr/rtlsdr.htm
There an alternative rtl-sdr library is available ##########################################################################
The boundaries for "legalFrequency" in "input/dabstick/dabstick.cpp" were set to accomodate the extended range as mentioned above. In my settings, real signal starts at app 13 Mhz