Is this for broadcasting, receiving, or both?
Both. "Full duplex".
Source available?
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Done in Microsoft Windows. Hackers who believe in freedom and sharing probably want to move to Linux or a BSD (or some more exotic open source platform) if they haven't already.
Windows: 71% market share
Ubuntu: 0.89% market share
No volunteer is going to put in the effort to support Ubuntu especially when the other ~5% of linux users would complain that you aren't supporting their even less used linux variant. They would then do a crappy job of adding support for their distribution and absolutely none of it would work.
If you develop for Linux, shouldn't the software build and run on all the distros (with the end user doing the building using "./configure" until the distro picks it up and packages it)? Even for hardware interfacing with SDR devices?
Yes. Yes it should. In practice, 100% "./configure" success is a pipe dream.
A pipe dream that's somehow worked for decades.
That’s interesting but I wonder what relevant stats are for the users of these libraries