Gqrx is distributed as source code as well as binary packages. The supported platform is Linux and to some extent Mac OS X.
A recent version of gqrx is probably already available through the official software channels of various Linux distributions and it is recommended to investigate that first. If those packages are too old or lack hardware support you can try some of these alternate options:
- Gqrx source code (SourceForge)
- Generic Gqrx binary package for 64 bit linux (SourceForge)
- Experimental AppImage for 64 bit linux (SourceForge)
- Gqrx binary package for LTS versions of Ubuntu Linux
- Gqrx binary package for the Raspberry Pi 3 and other armv6 boards running Debian Stretch
- Gqrx binary package for Mac OS X, experimental build and known to have problems. Built on Mac OS X 10.11 but might work up to 10.15 (SourceForge)
On Mac you can also install the latest version through Macports and probably also other package managers like Homebrew. I can only provide very limited support for Mac OS X.