For those having problems compiling this as of 2025-05-24, I was able to get it to build by not using Clang, but Gcc instead:
Replace
CC=clang CXX=clang++ cmake \
with
CC=gcc CXX=g++ cmake \
in the build function of the PKGBUILD. There are also some incompatibilities with audacity if you want both to be installed at the same time (files existing in both packages).
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