Is is a reasonable snippet of code for configure.in?
  Or is there a better one. I need to detect IPv6 (for mrt). It currently
detects KAME, but it then expects it to be in /usr/local/v6.

AC_EGREP_CPP(yes, [
#include <sys/param.h>
#ifdef __NetBSD_Version__
#if __NetBSD_Version__ > 105000000
yes 
#endif
#endif
], [actions])

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