GTK3+ port from original source https://github.com/segler-alex/rhythmbox-radio-browser/issues for Rhythmbox 3.0 and later
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git clone https://github.com/fossfreedom/radio-browser -b rb3 cd radio-browser ./install.sh
For a system wide install then:
git clone https://github.com/fossfreedom/radio-browser -b rb3 cd radio-browser sudo make install sudo glib-compile-schemas /usr/share/glib-2.0/schemas/
Then launch rhythmbox and enable the plugin "Internet Radio Browser"
You will need to install the equivalent packages for your distro: streamripper
packages required to be installed:
sudo apt-get install streamripper