duckstation

duckstation, but archived from the revision just before upstream changed it to a proprietary software project, this version is the libre one
git clone https://git.neptards.moe/u3shit/duckstation.git
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oss_is_v4.c (143B)

      1 #include <sys/soundcard.h>
      2 
      3 #if SOUND_VERSION < 0x040000
      4 # error "OSSv4 is not available in sys/soundcard.h"
      5 #endif
      6 
      7 int main()
      8 {
      9 	return 0;
     10 }