Desktop purr-data no longer builds on macOS

I just learned that make light no longer builds on macOS and I get the following error:

s_audio_pa.c:96:23: error: implicit declaration of function 'open' is invalid in
      C99 [-Werror,-Wimplicit-function-declaration]
        int another = open("/dev/null", 0);

I just tried the following:

git clone https://git.purrdata.net/jwilkes/purr-data
cd purr-data
make light

I also tried make all and it also fails to build with the same error. Were there any changes related to the s_audio_pa.c file or Makefile since last year?

I'm on macOS Catalina 10.15.7