I downloaded all from GIT, just tried and ended up with those errors.
EDIT:
I found more here:
https://github.com/pavels/rtl-sdr
Maybe this was missing?
By googling some more I found some promising apps:
http://eartoearoak.com/software/rtlsdr-scanner
http://zolli.altervista.org/rtl_sdr_...rum/index.html
https://github.com/keenerd/rtl-sdr
http://rfexplorer.com/touchstone/
https://github.com/xmikos/qspectrumanalyzer
The possible problem with them above is a general lack of source code.. so my hopes are with Pavel's code.