[], [AC_MSG_ERROR([Required header file missng])], [#include "$srcdir/src/have.h"]
)
;;
- *bsd*|*darwin*)
+ *bsd*|*dragonfly*|*darwin*)
AC_CHECK_HEADERS([net/if_tun.h net/if_utun.h net/tun/if_tun.h net/if_tap.h net/tap/if_tap.h],
[], [], [#include "$srcdir/src/have.h"]
)