From the GNURADIO website: "GNU Radio has a steep learning curve", Fuck off, what it really means is:
GNU Radio is porly written / implemented / not user fiendly / has too many obscure install options and is designed to simply waste your time.
Furthermore the build-gnuradio script is fucking stupid. It will ruin your system, beware. Best to stick to the deb packages if you are on Debian.