===> Building for spiralloops-2.0.0nb14
g++ -c -pipe -Os -I/opt/pkg/include -DDEVOSSAUDIO="\"\"" -DFLTK_1_0_COMPAT -pipe -Wall -O3 -ffast-math -DNO_DEBUG -Wno-unused   -o Loop.o Loop.C
In file included from Loop.C:19:
In file included from ./Loop.h:23:
./SpiralSound/Output.h:30:11: fatal error: 'sys/soundcard.h' file not found
        #include <sys/soundcard.h>
                 ^~~~~~~~~~~~~~~~~
1 error generated.
gmake: *** [Makefile:114: Loop.o] Error 1
*** Error code 2

Stop.
bmake[1]: stopped making "all" in /Volumes/data/jenkins/workspace/pkgsrc-macos-upstream-arm64/audio/spiralloops
*** Error code 1

Stop.
bmake: stopped making "all" in /Volumes/data/jenkins/workspace/pkgsrc-macos-upstream-arm64/audio/spiralloops