enhanced nwad functions

qse/configure

@@ -16082,6 +16082,18 @@ fi
 
 done
 
+for ac_header in net/if.h
+do :
+  ac_fn_c_check_header_mongrel "$LINENO" "net/if.h" "ac_cv_header_net_if_h" "$ac_includes_default"
+if test "x$ac_cv_header_net_if_h" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_NET_IF_H 1
+_ACEOF
+
+fi
+
+done
+
 
 ac_fn_c_check_type "$LINENO" "wchar_t" "ac_cv_type_wchar_t" "#include <stddef.h>
 "
@@ -16233,6 +16245,18 @@ _ACEOF
 fi
 done
 
+for ac_func in if_nametoindex if_indextoname
+do :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+done
+
 
 OLDLIBS="$LIBS"
 LIBS="$LIBM $LIBS"