Be aware that there is a shared library in the repo: portaudio_x64.dll
It's bad practice to load random DLLs off the web, so only use this repo as an example.
Just run dub run!
Preprocess the header file:
# Example using WSL (btw don't do this when mixing platforms)
gcc -m64 -E -P portaudio/portaudio.h -o portaudio/portaudio.c
And then:
dub run