Hi,
I've used OpenSUSE Build Service to build gqrx package. I am using it in my Fedora 18 successfully,
Maybe it will be useful not only for me, so I decided to share it with you.
These packages actually taken from OpenSUSE builds, many thanks to Walter Fey (dl8fcl), who maintains them.
I just adapted spec files to make them build for Fedora.
Also, there is no Fedora updates repo in OpenSUSE build service, so I keep a copy of gnuradio.
https://build.opensuse.org/project/show?project=home%3Asotrudnik%3Abranches%3Ahome%3Adl8fclCheers.