NetBSD has System V semaphores and shared memory.

nsprpub/pr/include/md/_netbsd.h

@@ -50,6 +50,8 @@
 #define _PR_HAVE_SOCKADDR_LEN
 #define _PR_NO_LARGE_FILES
 #define _PR_STAT_HAS_ST_ATIMESPEC
+#define _PR_HAVE_SYSV_SEMAPHORES
+#define PR_HAVE_SYSV_NAMED_SHARED_MEMORY
 
 #define USE_SETJMP