Bugzilla bug #63697: NetBSD 1.5 or newer has IPv6. Thanks to

martin@NetBSD.ORG (Martin Husemann) for the patch.

nsprpub/pr/include/md/_netbsd.h

@@ -78,6 +78,12 @@
 #define _PR_HAVE_SYSV_SEMAPHORES
 #define PR_HAVE_SYSV_NAMED_SHARED_MEMORY
 
+#if __NetBSD_Version__ >= 105000000
+#define _PR_INET6
+#define _PR_HAVE_GETHOSTBYNAME2
+#define _PR_INET6_PROBE
+#endif
+
 #define USE_SETJMP
 
 #ifndef _PR_PTHREADS