As of 2021-11-19, here's what I had to do to recompile portaudio
Download http://files.portaudio.com/archives/pa_stable_v190700_20210406.tgz Unpack cd portaudio mkdir jbcbuild cd jbcbuild ../configure make
the generated binary is in lib/.libs/, hidden to prevent ... mischief?
diff ~/portaudio/portaudio/portaudio.rkt ../include/portaudio.h
... any lines starting with > are lines that changed in the header file, repair them and address any changes that need to be made in the racket code as a result of changes in the header file.